Maria Elena Monzani
Lead Scientist, SLAC National Accelerator Laboratory
Current Role at Stanford
Lead Scientist, LUX-ZEPLIN Dark Matter Experiment
Kavli Institute for Particle Astrophysics and Cosmology
SLAC National Accelerator Laboratory
Honors & Awards
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Artificial Intelligence Research in High Energy Physics, DOE-HEP (2023)
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Reaching a New Energy Sciences Workforce, DOE-HEP (2022)
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Laboratory Directed Research and Development, SLAC (2022)
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Adjunct Scholar, Vatican Observatory, Vatican City State (2021)
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Exascale Science Applications Award (NESAP), NERSC (2019)
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LUX-ZEPLIN Operations Support to SLAC, DOE-HEP (2019)
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NERSC Mission Science Allocation Award, DOE-HEP (2018)
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Group Achievement Award, Fermi Science Team, NASA (2010)
Education & Certifications
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PhD, Université Paris 7 - Denis Diderot (2005)
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PhD, Università degli Studi di Milano (2005)
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M.S., Università degli Studi di Milano (2001)
Professional Interests
Maria Elena Monzani is a dark matter data wrangler. She manages the data processing pipeline for the Fermi-LAT and the computing and software operations for the LUX-ZEPLIN (LZ) experiment. LZ is an instrument that is superlative in many ways. It consists of 10 tons of liquified xenon gas, maintained at almost atomic purity and stored in a refrigerated titanium cylinder a mile underground in a former gold mine in Lead, South Dakota. The experiment is slated to acquire 5 PB of data over its lifetime (or 5 billion particle interactions). Due to their elusive nature, only a handful of dark matter particles would be discovered in the process. Finding those particles is an extreme "needle in a haystack" challenge, requiring an unprecedented level of analytical prowess and statistical accuracy. In addition to providing the computing infrastructure required to analyze such a large dataset, Maria Elena collaborates with computational engineers to develop advanced Machine Learning algorithms, that could sharpen our ability to identify ultra rare anomalies in massive datasets.
Work Experience
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Staff Scientist, SLAC National Accelerator Laboratory (2016 - 2020)
Location
Menlo Park, CA
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Engineering Physicist, SLAC National Accelerator Laboratory (2007 - 2016)
Location
Menlo Park, CA
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Postdoctoral Research Scientist, Columbia University (2006 - 2007)
Location
New York, NY
Professional Affiliations and Activities
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Member, American Physical Society
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Member, American Astronomical Society
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Member, Society of Catholic Scientists
All Publications
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The Third Fermi Large Area Telescope Catalog of Gamma-Ray Pulsars
ASTROPHYSICAL JOURNAL
2023; 958 (2)
View details for DOI 10.3847/1538-4357/acee67
View details for Web of Science ID 001117603900001
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Search for new physics in low-energy electron recoils from the first LZ exposure
PHYSICAL REVIEW D
2023; 108 (7)
View details for DOI 10.1103/PhysRevD.108.072006
View details for Web of Science ID 001102963500002
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Fermi-GBM Discovery of GRB 221009A: An Extraordinarily Bright GRB from Onset to Afterglow
ASTROPHYSICAL JOURNAL LETTERS
2023; 952 (2)
View details for DOI 10.3847/2041-8213/ace5b4
View details for Web of Science ID 001042049400001
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First Dark Matter Search Results from the LUX-ZEPLIN (LZ) Experiment.
Physical review letters
2023; 131 (4): 041002
Abstract
The LUX-ZEPLIN experiment is a dark matter detector centered on a dual-phase xenon time projection chamber operating at the Sanford Underground Research Facility in Lead, South Dakota, USA. This Letter reports results from LUX-ZEPLIN's first search for weakly interacting massive particles (WIMPs) with an exposure of 60 live days using a fiducial mass of 5.5 t. A profile-likelihood ratio analysis shows the data to be consistent with a background-only hypothesis, setting new limits on spin-independent WIMP-nucleon, spin-dependent WIMP-neutron, and spin-dependent WIMP-proton cross sections for WIMP masses above 9 GeV/c^{2}. The most stringent limit is set for spin-independent scattering at 36 GeV/c^{2}, rejecting cross sections above 9.2×10^{-48} cm at the 90% confidence level.
View details for DOI 10.1103/PhysRevLett.131.041002
View details for PubMedID 37566836
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Background determination for the LUX-ZEPLIN dark matter experiment
PHYSICAL REVIEW D
2023; 108 (1)
View details for DOI 10.1103/PhysRevD.108.012010
View details for Web of Science ID 001063210000004
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The Fermi-LAT Lightcurve Repository
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2023; 265 (2)
View details for DOI 10.3847/1538-4365/acbb6a
View details for Web of Science ID 000956013000001
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A next-generation liquid xenon observatory for dark matter and neutrino physics
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
2023; 50 (1)
View details for DOI 10.1088/1361-6471/ac841a
View details for Web of Science ID 000928191300001
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Low-energy Electron-track Imaging for a Liquid Argon Time-projection-chamber Telescope Concept Using Probabilistic Deep Learning
ASTROPHYSICAL JOURNAL
2023; 942 (2)
View details for DOI 10.3847/1538-4357/aca329
View details for Web of Science ID 000920097000001
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Search for New Cosmic-Ray Acceleration Sites within the 4FGL Catalog Galactic Plane Sources
ASTROPHYSICAL JOURNAL
2022; 933 (2)
View details for DOI 10.3847/1538-4357/ac704f
View details for Web of Science ID 000825100200001
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Incremental Fermi Large Area Telescope Fourth Source Catalog
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2022; 260 (2)
View details for DOI 10.3847/1538-4365/ac6751
View details for Web of Science ID 000819154400001
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Design and production of the high voltage electrode grids and electron extraction region for the LZ dual-phase xenon time projection chamber
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
2022; 1031
View details for DOI 10.1016/j.nima.2021.165955
View details for Web of Science ID 000796007600014
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A gamma-ray pulsar timing array constrains the nanohertz gravitational wave background
SCIENCE
2022; 376 (6592): 521-+
Abstract
After large galaxies merge, their central supermassive black holes are expected to form binary systems. Their orbital motion should generate a gravitational wave background (GWB) at nanohertz frequencies. Searches for this background use pulsar timing arrays, which perform long-term monitoring of millisecond pulsars at radio wavelengths. We used 12.5 years of Fermi Large Area Telescope data to form a gamma-ray pulsar timing array. Results from 35 bright gamma-ray pulsars place a 95% credible limit on the GWB characteristic strain of 1.0 × 10-14 at a frequency of 1 year-1. The sensitivity is expected to scale with tobs, the observing time span, as [Formula: see text]. This direct measurement provides an independent probe of the GWB while offering a check on radio noise models.
View details for DOI 10.1126/science.abm3231
View details for Web of Science ID 000791247600076
View details for PubMedID 35389746
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Cosmogenic production of Ar-37 in the context of the LUX-ZEPLIN experiment
PHYSICAL REVIEW D
2022; 105 (8)
View details for DOI 10.1103/PhysRevD.105.082004
View details for Web of Science ID 000809710600004
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The LUX-ZEPLIN (LZ) radioactivity and cleanliness control programs (vol 80, 1044, 2020)
EUROPEAN PHYSICAL JOURNAL C
2022; 82 (3)
View details for DOI 10.1140/epjc/s10052-022-09991-7
View details for Web of Science ID 000768874500002
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CMB-S4: Forecasting Constraints on Primordial Gravitational Waves
ASTROPHYSICAL JOURNAL
2022; 926 (1)
View details for DOI 10.3847/1538-4357/ac1596
View details for Web of Science ID 000754057900001
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Kiloton-scale xenon detectors for neutrinoless double beta decay and other new physics searches
PHYSICAL REVIEW D
2021; 104 (11)
View details for DOI 10.1103/PhysRevD.104.112007
View details for Web of Science ID 000734362100012
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Projected sensitivity of the LUX-ZEPLIN experiment to the two-neutrino and neutrinoless double beta decays of Xe-134
PHYSICAL REVIEW C
2021; 104 (6)
View details for DOI 10.1103/PhysRevC.104.065501
View details for Web of Science ID 000744189400002
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Projected sensitivities of the LUX-ZEPLIN experiment to new physics via low-energy electron recoils
PHYSICAL REVIEW D
2021; 104 (9)
View details for DOI 10.1103/PhysRevD.104.092009
View details for Web of Science ID 000723098900006
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Gamma Rays from Fast Black-hole Winds
ASTROPHYSICAL JOURNAL
2021; 921 (2)
View details for DOI 10.3847/1538-4357/ac1bb2
View details for Web of Science ID 000716730500001
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First Fermi-LAT Solar Flare Catalog (vol 252, 13, 2021)
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2021; 256 (1)
View details for DOI 10.3847/1538-4365/ac2155
View details for Web of Science ID 000696694200001
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Fermi Large Area Telescope Performance after 10 Years of Operation
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2021; 256 (1)
View details for DOI 10.3847/1538-4365/ac0ceb
View details for Web of Science ID 000692877400001
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Catalog of Long-term Transient Sources in the First 10 yr of Fermi-LAT Data
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2021; 256 (1)
View details for DOI 10.3847/1538-4365/ac072a
View details for Web of Science ID 000692874900001
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Simulations of events for the LUX-ZEPLIN (LZ) dark matter experiment
ASTROPARTICLE PHYSICS
2021; 125
View details for DOI 10.1016/j.astropartphys.2020.102480
View details for Web of Science ID 000576790400005
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First Fermi-LAT Solar Flare Catalog
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2021; 252 (2)
View details for DOI 10.3847/1538-4365/abd32e
View details for Web of Science ID 000608872500001
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High-energy emission from a magnetar giant flare in the Sculptor galaxy
NATURE ASTRONOMY
2021
View details for DOI 10.1038/s41550-020-01287-8
View details for Web of Science ID 000607487800001
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The LUX-ZEPLIN (LZ) radioactivity and cleanliness control programs
EUROPEAN PHYSICAL JOURNAL C
2020; 80 (11)
View details for DOI 10.1140/epjc/s10052-020-8420-x
View details for Web of Science ID 000593717000005
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Projected sensitivity of the LUX-ZEPLIN experiment to the 0 nu beta beta decay of Xe-136
PHYSICAL REVIEW C
2020; 102 (1)
View details for DOI 10.1103/PhysRevC.102.014602
View details for Web of Science ID 000548531400006
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The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
ASTROPHYSICAL JOURNAL
2020; 892 (2)
View details for DOI 10.3847/1538-4357/ab791e
View details for Web of Science ID 000523454000001
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Projected WIMP sensitivity of the LUX-ZEPLIN dark matter experiment
PHYSICAL REVIEW D
2020; 101 (5)
View details for DOI 10.1103/PhysRevD.101.052002
View details for Web of Science ID 000517963200002
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Measurement of the gamma ray background in the Davis cavern at the Sanford Underground Research Facility
ASTROPARTICLE PHYSICS
2020; 116
View details for DOI 10.1016/j.astropartphys.2019.102391
View details for Web of Science ID 000501416000003
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Fermi Large Area Telescope Fourth Source Catalog
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2020; 247 (1)
View details for DOI 10.3847/1538-4365/ab6bcb
View details for Web of Science ID 000520200200001
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The LUX-ZEPLIN (LZ) experiment
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
2020; 953
View details for DOI 10.1016/j.nima.2019.163047
View details for Web of Science ID 000506419900082
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Fermi and Swift Observations of GRB 190114C: Tracing the Evolution of High-energy Emission from Prompt to Afterglow
ASTROPHYSICAL JOURNAL
2020; 890 (1)
View details for DOI 10.3847/1538-4357/ab5b05
View details for Web of Science ID 000522095800009
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Optimization of Software on High Performance Computing Platforms for the LUX-ZEPLIN Dark Matter Experiment
E D P SCIENCES. 2020
View details for DOI 10.1051/epjconf/202024505012
View details for Web of Science ID 000652214300173
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Bright Gamma-Ray Flares Observed in GRB 131108A
ASTROPHYSICAL JOURNAL LETTERS
2019; 886 (2)
View details for DOI 10.3847/2041-8213/ab564f
View details for Web of Science ID 000499346800001
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A Decade of Gamma-Ray Bursts Observed by Fermi-LAT: The Second GRB Catalog
ASTROPHYSICAL JOURNAL
2019; 878 (1)
View details for DOI 10.3847/1538-4357/ab1d4e
View details for Web of Science ID 000471624300001
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MAGIC and Fermi-LAT gamma-ray results on unassociated HAWC sources
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2019; 485 (1): 356–66
View details for DOI 10.1093/mnras/stz089
View details for Web of Science ID 000466786400024
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Unresolved Gamma-Ray Sky through its Angular Power Spectrum
PHYSICAL REVIEW LETTERS
2018; 121 (24)
View details for DOI 10.1103/PhysRevLett.121.241101
View details for Web of Science ID 000452960100001
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A gamma-ray determination of the Universe's star formation history
SCIENCE
2018; 362 (6418): 1031-+
Abstract
The light emitted by all galaxies over the history of the Universe produces the extragalactic background light (EBL) at ultraviolet, optical, and infrared wavelengths. The EBL is a source of opacity for gamma rays via photon-photon interactions, leaving an imprint in the spectra of distant gamma-ray sources. We measured this attenuation using 739 active galaxies and one gamma-ray burst detected by the Fermi Large Area Telescope. This allowed us to reconstruct the evolution of the EBL and determine the star formation history of the Universe over 90% of cosmic time. Our star formation history is consistent with independent measurements from galaxy surveys, peaking at redshift z ~ 2. Upper limits of the EBL at the epoch of reionization suggest a turnover in the abundance of faint galaxies at z ~ 6.
View details for DOI 10.1126/science.aat8123
View details for Web of Science ID 000451609000039
View details for PubMedID 30498122
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VERITAS and Fermi-LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog
ASTROPHYSICAL JOURNAL
2018; 866 (1)
View details for DOI 10.3847/1538-4357/aade4e
View details for Web of Science ID 000446752400024
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Investigating the Nature of Late-time High-energy GRB Emission through Joint Fermi/Swift Observations
ASTROPHYSICAL JOURNAL
2018; 863 (2)
View details for DOI 10.3847/1538-4357/aad000
View details for Web of Science ID 000442070500015
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Investigating the Nature of Late-Time High-Energy GRB Emission Through Joint Fermi /Swift Observations.
The Astrophysical journal
2018; 863 (2)
Abstract
We use joint observations by the Neil Gehrels Swift X-ray Telescope (XRT) and the Fermi Large Area Telescope (LAT) of gamma-ray burst (GRB) afterglows to investigate the nature of the long-lived high-energy emission observed by Fermi LAT. Joint broadband spectral modeling of XRT and LAT data reveal that LAT non-detections of bright X-ray afterglows are consistent with a cooling break in the inferred electron synchrotron spectrum below the LAT and/or XRT energy ranges. Such a break is sufficient to suppress the high-energy emission so as to be below the LAT detection threshold. By contrast, LAT-detected bursts are best fit by a synchrotron spectrum with a cooling break that lies either between or above the XRT and LAT energy ranges. We speculate that the primary difference between GRBs with LAT afterglow detections and the non-detected population may be in the type of circumstellar environment in which these bursts occur, with late-time LAT detections preferentially selecting GRBs that occur in low wind-like circumburst density profiles. Furthermore, we find no evidence of high-energy emission in the LAT-detected population significantly in excess of the flux expected from the electron synchrotron spectrum fit to the observed X-ray emission. The lack of excess emission at high energies could be due to a shocked external medium in which the energy density in the magnetic field is stronger than or comparable to that of the relativistic electrons behind the shock, precluding the production of a dominant synchrotron self-Compton (SSC) component in the LAT energy range. Alternatively, the peak of the SSC emission could be beyond the 0.1-100 GeV energy range considered for this analysis.
View details for DOI 10.3847/1538-4357/aad000
View details for PubMedID 35027772
View details for PubMedCentralID PMC8753637
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The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2018; 237 (2)
View details for DOI 10.3847/1538-4365/aacdf7
View details for Web of Science ID 000441093400001
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Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
SCIENCE
2018; 361 (6398): 146-+
Abstract
Previous detections of individual astrophysical sources of neutrinos are limited to the Sun and the supernova 1987A, whereas the origins of the diffuse flux of high-energy cosmic neutrinos remain unidentified. On 22 September 2017, we detected a high-energy neutrino, IceCube-170922A, with an energy of ~290 tera-electron volts. Its arrival direction was consistent with the location of a known γ-ray blazar, TXS 0506+056, observed to be in a flaring state. An extensive multiwavelength campaign followed, ranging from radio frequencies to γ-rays. These observations characterize the variability and energetics of the blazar and include the detection of TXS 0506+056 in very-high-energy γ-rays. This observation of a neutrino in spatial coincidence with a γ-ray-emitting blazar during an active phase suggests that blazars may be a source of high-energy neutrinos.
View details for DOI 10.1126/science.aat1378
View details for Web of Science ID 000438449200037
View details for PubMedID 30002226
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Fermi-LAT Observations of LIGO/Virgo Event GW170817
ASTROPHYSICAL JOURNAL
2018; 861 (2)
View details for DOI 10.3847/1538-4357/aac515
View details for Web of Science ID 000437822700010
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Search for Gamma-Ray Emission from the Coma Cluster with Six Years of Fermi-LAT Data (vol 819, 149, 2016)
ASTROPHYSICAL JOURNAL
2018; 860 (1)
View details for DOI 10.3847/1538-4357/aac7c3
View details for Web of Science ID 000435366000010
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Search for Gamma-Ray Emission from Local Primordial Black Holes with the Fermi Large Area Telescope
ASTROPHYSICAL JOURNAL
2018; 857 (1)
View details for DOI 10.3847/1538-4357/aaac7b
View details for Web of Science ID 000429836900014
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Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar
SCIENCE ADVANCES
2018; 4 (2)
View details for DOI 10.1126/sciadv.aao7228
View details for Web of Science ID 000426845500043
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Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar.
Science advances
2018; 4 (2): eaao7228
Abstract
Millisecond pulsars (MSPs) are old neutron stars that spin hundreds of times per second and appear to pulsate as their emission beams cross our line of sight. To date, radio pulsations have been detected from all rotation-powered MSPs. In an attempt to discover radio-quiet gamma-ray MSPs, we used the aggregated power from the computers of tens of thousands of volunteers participating in the Einstein@Home distributed computing project to search for pulsations from unidentified gamma-ray sources in Fermi Large Area Telescope data. This survey discovered two isolated MSPs, one of which is the only known rotation-powered MSP to remain undetected in radio observations. These gamma-ray MSPs were discovered in completely blind searches without prior constraints from other observations, raising hopes for detecting MSPs from a predicted Galactic bulge population.
View details for DOI 10.1126/sciadv.aao7228
View details for PubMedID 29503868
View details for PubMedCentralID PMC5829974
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The electronics, trigger and data acquisition system for the liquid argon time projection chamber of the DarkSide-50 search for dark matter
JOURNAL OF INSTRUMENTATION
2017; 12
View details for DOI 10.1088/1748-0221/12/12/P12011
View details for Web of Science ID 000417761100008
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Identification of radiopure titanium for the LZ dark matter experiment and future rare event searches
ASTROPARTICLE PHYSICS
2017; 96: 1–10
View details for DOI 10.1016/j.astropartphys.2017.09.002
View details for Web of Science ID 000416185400001
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Multi-messenger Observations of a Binary Neutron Star Merger
ASTROPHYSICAL JOURNAL LETTERS
2017; 848 (2)
View details for DOI 10.3847/2041-8213/aa91c9
View details for Web of Science ID 000413211000001
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3FHL: The Third Catalog of Hard Fermi-LAT Sources
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2017; 232 (2)
View details for DOI 10.3847/1538-4365/aa8221
View details for Web of Science ID 000411892800001
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Fermi Observations of the LIGO Event GW170104
ASTROPHYSICAL JOURNAL LETTERS
2017; 846 (1)
View details for DOI 10.3847/2041-8213/aa8319
View details for Web of Science ID 000408509200003
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The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis
ASTROPHYSICAL JOURNAL
2017; 846 (1)
View details for DOI 10.3847/1538-4357/aa8092
View details for Web of Science ID 000408687300011
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Search for Extended Sources in the Galactic Plane Using Six Years of Fermi-Large Area Telescope Pass 8 Data above 10GeV
ASTROPHYSICAL JOURNAL
2017; 843 (2)
View details for DOI 10.3847/1538-4357/aa775a
View details for Web of Science ID 000405673400013
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The Fermi Galactic Center GeV Excess and Implications for Dark Matter
ASTROPHYSICAL JOURNAL
2017; 840 (1)
View details for DOI 10.3847/1538-4357/aa6cab
View details for Web of Science ID 000403223600002
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Cosmic-ray electron-positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope
PHYSICAL REVIEW D
2017; 95 (8)
View details for DOI 10.1103/PhysRevD.95.082007
View details for Web of Science ID 000399807800001
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Gamma-ray blazar spectra with HESS II mono analysis: The case of PKS2155-304 and PG1553+113
ASTRONOMY & ASTROPHYSICS
2017; 600
View details for DOI 10.1051/0004-6361/201629427
View details for Web of Science ID 000400754000055
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Gamma-Ray Blazars within the First 2 Billion Years
ASTROPHYSICAL JOURNAL LETTERS
2017; 837 (1)
View details for DOI 10.3847/2041-8213/aa5fff
View details for Web of Science ID 000401605500005
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Search for Cosmic-Ray Electron and Positron Anisotropies with Seven Years of Fermi Large Area Telescope Data
PHYSICAL REVIEW LETTERS
2017; 118 (9)
Abstract
The Large Area Telescope on board the Fermi Gamma-ray Space Telescope has collected the largest ever sample of high-energy cosmic-ray electron and positron events since the beginning of its operation. Potential anisotropies in the arrival directions of cosmic-ray electrons or positrons could be a signature of the presence of nearby sources. We use almost seven years of data with energies above 42 GeV processed with the Pass 8 reconstruction. The present data sample can probe dipole anisotropies down to a level of 10^{-3}. We take into account systematic effects that could mimic true anisotropies at this level. We present a detailed study of the event selection optimization of the cosmic-ray electrons and positrons to be used for anisotropy searches. Since no significant anisotropies have been detected on any angular scale, we present upper limits on the dipole anisotropy. The present constraints are among the strongest to date probing the presence of nearby young and middle-aged sources.
View details for DOI 10.1103/PhysRevLett.118.091103
View details for PubMedID 28306280
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Observations of M31 and M33 with the Fermi Large Area Telescope: A Galactic Center Excess in Andromeda?
ASTROPHYSICAL JOURNAL
2017; 836 (2)
View details for DOI 10.3847/1538-4357/aa5c3d
View details for Web of Science ID 000395870900001
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Fermi-LAT Observations of High-energy Behind-the-limb Solar Flares
ASTROPHYSICAL JOURNAL
2017; 835 (2)
View details for DOI 10.3847/1538-4357/835/2/219
View details for Web of Science ID 000401154800011
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SEARCHING THE GAMMA-RAY SKY FOR COUNTERPARTS TO GRAVITATIONAL WAVE SOURCES: FERMI GAMMA-RAY BURST MONITOR. AND LARGE AREA TELESCOPE OBSERVATIONS OF LVT151012 AND GW151226
ASTROPHYSICAL JOURNAL
2017; 835 (1)
View details for DOI 10.3847/1538-4357/835/1/82
View details for Web of Science ID 000393455400082
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The DarkSide Direct Dark Matter Search with Liquid Argon
AMER INST PHYSICS. 2017
View details for DOI 10.1063/1.5010122
View details for Web of Science ID 000417409600018
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The DarkSide experiment
NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS
2017; 40 (1)
View details for DOI 10.1393/ncc/i2017-17052-3
View details for Web of Science ID 000397330100047
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The electronics and data acquisition system for the DarkSide-50 veto detectors
JOURNAL OF INSTRUMENTATION
2016; 11
View details for DOI 10.1088/1748-0221/11/12/P12007
View details for Web of Science ID 000395732500007
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FERMI LARGE AREA TELESCOPE DETECTION OF EXTENDED GAMMA-RAY EMISSION FROM THE RADIO GALAXY FORNAX A
ASTROPHYSICAL JOURNAL
2016; 826 (1)
View details for DOI 10.3847/0004-637X/826/1/1
View details for Web of Science ID 000381962200001
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LOCALIZATION AND BROADBAND FOLLOW-UP OF THE GRAVITATIONAL-WAVE TRANSIENT GW 150914
ASTROPHYSICAL JOURNAL LETTERS
2016; 826 (1)
View details for DOI 10.3847/2041-8205/826/1/L13
View details for Web of Science ID 000380739300013
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SUPPLEMENT: "LOCALIZATION AND BROADBAND FOLLOW-UP OF THE GRAVITATIONAL-WAVE TRANSIENT GW150914" (2016, ApJL, 826, L13)
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2016; 225 (1)
View details for DOI 10.3847/0067-0049/225/1/8
View details for Web of Science ID 000382309000008
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The DarkSide physics program and its recent results
NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS
2016; 39 (4)
View details for DOI 10.1393/ncc/i2016-16312-0
View details for Web of Science ID 000397319700002
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MINUTE-TIMESCALE > 100 MeV gamma-RAY VARIABILITY DURING THE GIANT OUTBURST OF QUASAR 3C 279 OBSERVED BY FERMI-LAT IN 2015 JUNE
ASTROPHYSICAL JOURNAL LETTERS
2016; 824 (2)
View details for DOI 10.3847/2041-8205/824/2/L20
View details for Web of Science ID 000378168200004
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FERMI-LAT OBSERVATIONS OF THE LIGO EVENT GW150914
ASTROPHYSICAL JOURNAL LETTERS
2016; 823 (1)
View details for DOI 10.3847/2041-8205/823/1/L2
View details for Web of Science ID 000376391700002
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FERMI LAT STACKING ANALYSIS OF SWIFT LOCALIZED GRBs
ASTROPHYSICAL JOURNAL
2016; 822 (2)
View details for DOI 10.3847/0004-637X/822/2/68
View details for Web of Science ID 000377204900011
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THE FIRST FERMI LAT SUPERNOVA REMNANT CATALOG
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2016; 224 (1)
View details for DOI 10.3847/0067-0049/224/1/8
View details for Web of Science ID 000377050200008
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Search for Spectral Irregularities due to Photon-Axionlike-Particle Oscillations with the Fermi Large Area Telescope
PHYSICAL REVIEW LETTERS
2016; 116 (16)
Abstract
We report on the search for spectral irregularities induced by oscillations between photons and axionlike-particles (ALPs) in the γ-ray spectrum of NGC 1275, the central galaxy of the Perseus cluster. Using 6 years of Fermi Large Area Telescope data, we find no evidence for ALPs and exclude couplings above 5×10^{-12} GeV^{-1} for ALP masses 0.5≲m_{a}≲5 neV at 95% confidence. The limits are competitive with the sensitivity of planned laboratory experiments, and, together with other bounds, strongly constrain the possibility that ALPs can reduce the γ-ray opacity of the Universe.
View details for DOI 10.1103/PhysRevLett.116.161101
View details for Web of Science ID 000374559300002
View details for PubMedID 27152783
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Measurement of the high-energy gamma-ray emission from the Moon with the Fermi Large Area Telescope.
Physical review. D. (2016)
2016; 93 (8): 082001
Abstract
We have measured the gamma-ray emission spectrum of the Moon using the data collected by the Large Area Telescope onboard the Fermi satellite during its first seven years of operation, in the energy range from 30 MeV up to a few GeV. We have also studied the time evolution of the flux, finding a correlation with the solar activity. We have developed a full Monte Carlo simulation describing the interactions of cosmic rays with the lunar surface. The results of the present analysis can be explained in the framework of this model, where the production of gamma rays is due to the interactions of cosmic-ray proton and helium nuclei with the surface of the Moon. Finally, we have used our simulation to derive the cosmic-ray proton and helium spectra near Earth from the Moon gamma-ray data.
View details for DOI 10.1103/PhysRevD.93.082001
View details for PubMedID 32743154
View details for PubMedCentralID PMC7394319
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Resolving the Extragalactic gamma-Ray Background above 50 GeV with the Fermi Large Area Telescope
PHYSICAL REVIEW LETTERS
2016; 116 (15)
Abstract
The Fermi Large Area Telescope (LAT) Collaboration has recently released a catalog of 360 sources detected above 50 GeV (2FHL). This catalog was obtained using 80 months of data re-processed with Pass 8, the newest event-level analysis, which significantly improves the acceptance and angular resolution of the instrument. Most of the 2FHL sources at high Galactic latitude are blazars. Using detailed Monte Carlo simulations, we measure, for the first time, the source count distribution, dN/dS, of extragalactic γ-ray sources at E>50 GeV and find that it is compatible with a Euclidean distribution down to the lowest measured source flux in the 2FHL (∼8×10^{-12} ph cm^{-2} s^{-1}). We employ a one-point photon fluctuation analysis to constrain the behavior of dN/dS below the source detection threshold. Overall, the source count distribution is constrained over three decades in flux and found compatible with a broken power law with a break flux, S_{b}, in the range [8×10^{-12},1.5×10^{-11}] ph cm^{-2} s^{-1} and power-law indices below and above the break of α_{2}∈[1.60,1.75] and α_{1}=2.49±0.12, respectively. Integration of dN/dS shows that point sources account for at least 86_{-14}^{+16}% of the total extragalactic γ-ray background. The simple form of the derived source count distribution is consistent with a single population (i.e., blazars) dominating the source counts to the minimum flux explored by this analysis. We estimate the density of sources detectable in blind surveys that will be performed in the coming years by the Cherenkov Telescope Array.
View details for DOI 10.1103/PhysRevLett.116.151105
View details for PubMedID 27127954
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Measurement of the high-energy gamma-ray emission from the Moon with the Fermi Large Area Telescope
PHYSICAL REVIEW D
2016; 93 (8)
View details for DOI 10.1103/PhysRevD.93.082001
View details for Web of Science ID 000373584900002
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Results from the first use of low radioactivity argon in a dark matter search
PHYSICAL REVIEW D
2016; 93 (8)
View details for DOI 10.1103/PhysRevD.93.081101
View details for Web of Science ID 000373584900001
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DEVELOPMENT OF THE MODEL OF GALACTIC INTERSTELLAR EMISSION FOR STANDARD POINT-SOURCE ANALYSIS OF FERMI LARGE AREA TELESCOPE DATA
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2016; 223 (2)
View details for DOI 10.3847/0067-0049/223/2/26
View details for Web of Science ID 000375304600008
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A first walk on the DarkSide
ELSEVIER. 2016: 452-458
View details for DOI 10.1016/j.nuclphysbps.2015.09.066
View details for Web of Science ID 000390295200065
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CONTEMPORANEOUS BROADBAND OBSERVATIONS OF THREE HIGH-REDSHIFT BL LAC OBJECTS
ASTROPHYSICAL JOURNAL
2016; 820 (1)
View details for DOI 10.3847/0004-637X/820/1/72
View details for Web of Science ID 000372787000071
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SEARCH FOR GAMMA-RAY EMISSION FROM THE COMA CLUSTER WITH SIX YEARS OF FERMI-LAT DATA
ASTROPHYSICAL JOURNAL
2016; 819 (2)
View details for DOI 10.3847/0004-637X/819/2/149
View details for Web of Science ID 000372305700061
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DEEP MORPHOLOGICAL AND SPECTRAL STUDY OF THE SNR RCW 86 WITH FERMI-LAT
ASTROPHYSICAL JOURNAL
2016; 819 (2)
View details for DOI 10.3847/0004-637X/819/2/98
View details for Web of Science ID 000372305700010
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FERMI-LAT OBSERVATIONS OF HIGH-ENERGY gamma-RAY EMISSION TOWARD THE GALACTIC CENTER
ASTROPHYSICAL JOURNAL
2016; 819 (1)
View details for DOI 10.3847/0004-637X/819/1/44
View details for Web of Science ID 000372303400044
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The veto system of the DarkSide-50 experiment
JOURNAL OF INSTRUMENTATION
2016; 11
View details for DOI 10.1088/1748-0221/11/03/P03016
View details for Web of Science ID 000375746200079
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Deep view of the Large Magellanic Cloud with six years of Fermi-LAT observations
ASTRONOMY & ASTROPHYSICS
2016; 586
View details for DOI 10.1051/0004-6361/201526920
View details for Web of Science ID 000369715900082
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The DarkSide project
JOURNAL OF INSTRUMENTATION
2016; 11
View details for DOI 10.1088/1748-0221/11/02/C02051
View details for Web of Science ID 000371479800051
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2FHL: THE SECOND CATALOG OF HARD FERMI-LAT SOURCES
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2016; 222 (1)
View details for DOI 10.3847/0067-0049/222/1/5
View details for Web of Science ID 000368982300005
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The DarkSide-50 outer detectors
IOP PUBLISHING LTD. 2016
View details for DOI 10.1088/1742-6596/718/4/042062
View details for Web of Science ID 000391490200088
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The DarkSide awakens
IOP PUBLISHING LTD. 2016
View details for DOI 10.1088/1742-6596/718/4/042016
View details for Web of Science ID 000391490200042
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The DarkSide Program
E D P SCIENCES. 2016
View details for DOI 10.1051/epjconf/201612106010
View details for Web of Science ID 000387433200048
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Current status of the dark matter experiment DarkSide-50
NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS
2016; 39 (1)
View details for DOI 10.1393/ncc/i2016-16247-4
View details for Web of Science ID 000383393400045
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VERY HIGH ENERGY gamma-RAYS FROM THE UNIVERSE'S MIDDLE AGE: DETECTION OF THE z=0.940 BLAZAR PKS 1441+25 WITH MAGIC
ASTROPHYSICAL JOURNAL LETTERS
2015; 815 (2)
View details for DOI 10.1088/2041-8205/815/2/L23
View details for Web of Science ID 000369081700007
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Searching for Dark Matter Annihilation from Milky Way Dwarf Spheroidal Galaxies with Six Years of Fermi Large Area Telescope Data
PHYSICAL REVIEW LETTERS
2015; 115 (23)
Abstract
The dwarf spheroidal satellite galaxies (dSphs) of the Milky Way are some of the most dark matter (DM) dominated objects known. We report on γ-ray observations of Milky Way dSphs based on six years of Fermi Large Area Telescope data processed with the new Pass8 event-level analysis. None of the dSphs are significantly detected in γ rays, and we present upper limits on the DM annihilation cross section from a combined analysis of 15 dSphs. These constraints are among the strongest and most robust to date and lie below the canonical thermal relic cross section for DM of mass ≲100 GeV annihilating via quark and τ-lepton channels.
View details for DOI 10.1103/PhysRevLett.115.231301
View details for PubMedID 26684107
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An extremely bright gamma-ray pulsar in the Large Magellanic Cloud
SCIENCE
2015; 350 (6262): 801-805
Abstract
Pulsars are rapidly spinning, highly magnetized neutron stars, created in the gravitational collapse of massive stars. We report the detection of pulsed giga-electron volt gamma rays from the young pulsar PSR J0540-6919 in the Large Magellanic Cloud, a satellite galaxy of the Milky Way. This is the first gamma-ray pulsar detected in another galaxy. It has the most luminous pulsed gamma-ray emission yet observed, exceeding the Crab pulsar's by a factor of 20. PSR J0540-6919 presents an extreme test case for understanding the structure and evolution of neutron star magnetospheres.
View details for DOI 10.1126/science.aac7400
View details for Web of Science ID 000364897000041
View details for PubMedID 26564852
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MULTIWAVELENGTH EVIDENCE FOR QUASI-PERIODIC MODULATION IN THE GAMMA-RAY BLAZAR PG 1553+113
ASTROPHYSICAL JOURNAL LETTERS
2015; 813 (2)
View details for DOI 10.1088/2041-8205/813/2/L41
View details for Web of Science ID 000365035000019
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SEARCH FOR EXTENDED GAMMA-RAY EMISSION FROM THE VIRGO GALAXY CLUSTER WITH FERMI-LAT
ASTROPHYSICAL JOURNAL
2015; 812 (2)
View details for DOI 10.1088/0004-637X/812/2/159
View details for Web of Science ID 000365206600071
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THE THIRD CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2015; 810 (1)
View details for DOI 10.1088/0004-637X/810/1/14
View details for Web of Science ID 000361800900014
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Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
2015
View details for DOI 10.1088/1475-7516/2015/09/008
View details for Web of Science ID 000365690000008
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PSR J1906+0722: AN ELUSIVE GAMMA-RAY PULSAR
ASTROPHYSICAL JOURNAL LETTERS
2015; 809 (1)
View details for DOI 10.1088/2041-8205/809/1/L2
View details for Web of Science ID 000359321900002
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SEARCH FOR EARLY GAMMA-RAY PRODUCTION IN SUPERNOVAE LOCATED IN A DENSE CIRCUMSTELLAR MEDIUM WITH THE FERMI LAT
ASTROPHYSICAL JOURNAL
2015; 807 (2)
View details for DOI 10.1088/0004-637X/807/2/169
View details for Web of Science ID 000358967000055
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Updated search for spectral lines from Galactic dark matter interactions with pass 8 data from the Fermi Large Area Telescope
PHYSICAL REVIEW D
2015; 91 (12)
View details for DOI 10.1103/PhysRevD.91.122002
View details for Web of Science ID 000356583600002
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SECOND CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE (vol 743, 171, 2011)
ASTROPHYSICAL JOURNAL
2015; 806 (1)
View details for DOI 10.1088/0004-637X/806/1/144
View details for Web of Science ID 000356810300144
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FERMI LARGE AREA TELESCOPE THIRD SOURCE CATALOG
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2015; 218 (2)
View details for DOI 10.1088/0067-0049/218/2/23
View details for Web of Science ID 000357122200009
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First results from the DarkSide-50 dark matter experiment at Laboratori Nazionali del Gran Sasso
PHYSICS LETTERS B
2015; 743: 456-466
View details for DOI 10.1016/j.physletb.2015.03.012
View details for Web of Science ID 000352147500068
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GAMMA-RAY FLARING ACTIVITY FROM THE GRAVITATIONALLY LENSED BLAZAR PKS 1830-211 OBSERVED BY Fermi LAT
ASTROPHYSICAL JOURNAL
2015; 799 (2)
View details for DOI 10.1088/0004-637X/799/2/143
View details for Web of Science ID 000348820900030
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THE SPECTRUM OF ISOTROPIC DIFFUSE GAMMA-RAY EMISSION BETWEEN 100 MeV AND 820 GeV
ASTROPHYSICAL JOURNAL
2015; 799 (1)
View details for DOI 10.1088/0004-637X/799/1/86
View details for Web of Science ID 000348214500084
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The DarkSide veto: muon and neutron detectors
NUOVO CIMENTO C-COLLOQUIA AND COMMUNICATIONS IN PHYSICS
2015; 38 (1)
View details for DOI 10.1393/ncc/i2015-15035-0
View details for Web of Science ID 000372727000035
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The DarkSide Multiton Detector for the Direct Dark Matter Search
ADVANCES IN HIGH ENERGY PHYSICS
2015; 2015
View details for DOI 10.1155/2015/541362
View details for Web of Science ID 000353133400001
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DarkSide-50: a WIMP search with a two-phase argon TPC
ELSEVIER SCIENCE BV. 2015: 124-129
View details for DOI 10.1016/j.phpro.2014.12.021
View details for Web of Science ID 000380402900018
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Direct Search for Dark Matter with DarkSide
IOP PUBLISHING LTD. 2015
View details for DOI 10.1088/1742-6596/650/1/012006
View details for Web of Science ID 000368140400006
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THE SPECTRUM AND MORPHOLOGY OF THE FERMI BUBBLES
ASTROPHYSICAL JOURNAL
2014; 793 (1)
View details for DOI 10.1088/0004-637X/793/1/64
View details for Web of Science ID 000341301700064
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Fermi establishes classical novae as a distinct class of gamma-ray sources
SCIENCE
2014; 345 (6196): 554-558
View details for DOI 10.1126/science.1253947
View details for Web of Science ID 000339651300043
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IMPULSIVE AND LONG DURATION HIGH-ENERGY GAMMA-RAY EMISSION FROM THE VERY BRIGHT 2012 MARCH 7 SOLAR FLARES
ASTROPHYSICAL JOURNAL
2014; 789 (1)
View details for DOI 10.1088/0004-637X/789/1/20
View details for Web of Science ID 000338103400020
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SEARCH FOR COSMIC-RAY-INDUCED GAMMA-RAY EMISSION IN GALAXY CLUSTERS
ASTROPHYSICAL JOURNAL
2014; 787 (1)
View details for DOI 10.1088/0004-637X/787/1/18
View details for Web of Science ID 000335924200018
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HIGH-ENERGY GAMMA-RAY EMISSION FROM SOLAR FLARES: SUMMARY OF FERMI LARGE AREA TELESCOPE DETECTIONS AND ANALYSIS OF TWO M-CLASS FLARES
ASTROPHYSICAL JOURNAL
2014; 787 (1)
View details for DOI 10.1088/0004-637X/787/1/15
View details for Web of Science ID 000335924200015
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MULTIFREQUENCY STUDIES OF THE PECULIAR QUASAR 4C+21.35 DURING THE 2010 FLARING ACTIVITY
ASTROPHYSICAL JOURNAL
2014; 786 (2)
View details for DOI 10.1088/0004-637X/786/2/157
View details for Web of Science ID 000335884500080
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Inferred cosmic-ray spectrum from Fermi large area telescope ?-ray observations of Earth's limb.
Physical review letters
2014; 112 (15): 151103-?
Abstract
Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual softening of the spectra just below a few hundred GeV, and a harder spectrum of He compared to that of protons. These newly discovered features may offer a clue to the origin of high-energy CRs. We use the Fermi Large Area Telescope observations of the γ-ray emission from Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range ∼90 GeV-6 TeV (derived from a photon energy range 15 GeV-1 TeV). Our analysis shows that single power law and broken power law spectra fit the data equally well and yield a proton spectrum with index 2.68±0.04 and 2.61±0.08 above ∼200 GeV, respectively.
View details for PubMedID 24785023
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Inferred Cosmic-Ray Spectrum from Fermi Large Area Telescope gamma-Ray Observations of Earth's Limb
PHYSICAL REVIEW LETTERS
2014; 112 (15)
Abstract
Recent accurate measurements of cosmic-ray (CR) species by ATIC-2, CREAM, and PAMELA reveal an unexpected hardening in the proton and He spectra above a few hundred GeV, a gradual softening of the spectra just below a few hundred GeV, and a harder spectrum of He compared to that of protons. These newly discovered features may offer a clue to the origin of high-energy CRs. We use the Fermi Large Area Telescope observations of the γ-ray emission from Earth's limb for an indirect measurement of the local spectrum of CR protons in the energy range ∼90 GeV-6 TeV (derived from a photon energy range 15 GeV-1 TeV). Our analysis shows that single power law and broken power law spectra fit the data equally well and yield a proton spectrum with index 2.68±0.04 and 2.61±0.08 above ∼200 GeV, respectively.
View details for DOI 10.1103/PhysRevLett.112.151103
View details for Web of Science ID 000334597300003
View details for PubMedID 24785023
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DEEP BROADBAND OBSERVATIONS OF THE DISTANT GAMMA-RAY BLAZAR PKS 1424+240
ASTROPHYSICAL JOURNAL LETTERS
2014; 785 (1)
View details for DOI 10.1088/2041-8205/785/1/L16
View details for Web of Science ID 000334345000016
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Fermi LARGE AREA TELESCOPE OBSERVATIONS OF BLAZAR 3C 279 OCCULTATIONS BY THE SUN
ASTROPHYSICAL JOURNAL
2014; 784 (2)
View details for DOI 10.1088/0004-637X/784/2/118
View details for Web of Science ID 000335519400033
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Fermi LARGE AREA TELESCOPE OBSERVATIONS OF BLAZAR 3C 279 OCCULTATIONS BY THE SUN.
The Astrophysical journal
2014; 784 (2)
Abstract
Observations of occultations of bright γ-ray sources by the Sun may reveal predicted pair halos around blazars and/or new physics, such as, e.g., hypothetical light dark matter particles-axions. We use Fermi Gamma-Ray Space Telescope (Fermi) data to analyze four occultations of blazar 3C 279 by the Sun on October 8 each year from 2008 to 2011. A combined analysis of the observations of these occultations allows a point-like source at the position of 3C 279 to be detected with significance of ≈3σ, but does not reveal any significant excess over the flux expected from the quiescent Sun. The likelihood ratio test rules out complete transparency of the Sun to the blazar γ-ray emission at a 3σ confidence level.
View details for DOI 10.1088/0004-637X/784/2/118
View details for PubMedID 34646038
View details for PubMedCentralID PMC8506895
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Dark matter constraints from observations of 25 Milky Way satellite galaxies with the Fermi Large Area Telescope
PHYSICAL REVIEW D
2014; 89 (4)
View details for DOI 10.1103/PhysRevD.89.042001
View details for Web of Science ID 000339630400001
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The First Pulse of the Extremely Bright GRB 130427A: A Test Lab for Synchrotron Shocks
SCIENCE
2014; 343 (6166): 51-54
Abstract
Gamma-ray burst (GRB) 130427A is one of the most energetic GRBs ever observed. The initial pulse up to 2.5 seconds is possibly the brightest well-isolated pulse observed to date. A fine time resolution spectral analysis shows power-law decays of the peak energy from the onset of the pulse, consistent with models of internal synchrotron shock pulses. However, a strongly correlated power-law behavior is observed between the luminosity and the spectral peak energy that is inconsistent with curvature effects arising in the relativistic outflow. It is difficult for any of the existing models to account for all of the observed spectral and temporal behaviors simultaneously.
View details for DOI 10.1126/science.1242302
View details for Web of Science ID 000329162000044
View details for PubMedID 24263132
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Fermi-LAT Observations of the Gamma-Ray Burst GRB 130427A
SCIENCE
2014; 343 (6166): 42-47
Abstract
The observations of the exceptionally bright gamma-ray burst (GRB) 130427A by the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope provide constraints on the nature of these unique astrophysical sources. GRB 130427A had the largest fluence, highest-energy photon (95 GeV), longest γ-ray duration (20 hours), and one of the largest isotropic energy releases ever observed from a GRB. Temporal and spectral analyses of GRB 130427A challenge the widely accepted model that the nonthermal high-energy emission in the afterglow phase of GRBs is synchrotron emission radiated by electrons accelerated at an external shock.
View details for DOI 10.1126/science.1242353
View details for Web of Science ID 000329162000042
View details for PubMedID 24263133
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THE FIRST FERMI-LAT CATALOG OF SOURCES ABOVE 10 GeV
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2013; 209 (2)
View details for DOI 10.1088/0067-0049/209/2/34
View details for Web of Science ID 000328059500016
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FERMI LARGE AREA TELESCOPE STUDY OF COSMIC-RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS (vol 755, 22, 2012)
ASTROPHYSICAL JOURNAL
2013; 778 (1)
View details for DOI 10.1088/0004-637X/778/1/82
View details for Web of Science ID 000327131700082
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PSR J2021+4026 IN THE GAMMA CYGNI REGION: THE FIRST VARIABLE gamma-RAY PULSAR SEEN BY THE Fermi LAT
ASTROPHYSICAL JOURNAL LETTERS
2013; 777 (1)
View details for DOI 10.1088/2041-8205/777/1/L2
View details for Web of Science ID 000326187400002
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DarkSide search for dark matter
IOP PUBLISHING LTD. 2013
View details for DOI 10.1088/1748-0221/8/11/C11021
View details for Web of Science ID 000329193500021
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THE FIRST FERMI-LAT GAMMA-RAY BURST CATALOG
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2013; 209 (1)
View details for DOI 10.1088/0067-0049/209/1/11
View details for Web of Science ID 000326571000011
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Search for gamma-ray spectral lines with the Fermi Large Area Telescope and dark matter implications
PHYSICAL REVIEW D
2013; 88 (8)
View details for DOI 10.1103/PhysRevD.88.082002
View details for Web of Science ID 000326107300001
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THE SECOND FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2013; 208 (2)
View details for DOI 10.1088/0067-0049/208/2/17
View details for Web of Science ID 000325276600004
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ASSOCIATING LONG-TERM gamma-RAY VARIABILITY WITH THE SUPERORBITAL PERIOD OF LS I+61 degrees 303
ASTROPHYSICAL JOURNAL LETTERS
2013; 773 (2)
View details for DOI 10.1088/2041-8205/773/2/L35
View details for Web of Science ID 000322899600018
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CONSTRAINTS ON THE GALACTIC POPULATION OF TeV PULSAR WIND NEBULAE USING FERMI LARGE AREA TELESCOPE OBSERVATIONS
ASTROPHYSICAL JOURNAL
2013; 773 (1)
View details for DOI 10.1088/0004-637X/773/1/77
View details for Web of Science ID 000322531900077
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CONSTRAINTS ON THE COSMIC-RAY DENSITY GRADIENT BEYOND THE SOLAR CIRCLE FROM FERMI gamma-RAY OBSERVATIONS OF THE THIRD GALACTIC QUADRANT (vol 726, pg 81, 2011)
ASTROPHYSICAL JOURNAL
2013; 772 (2)
View details for DOI 10.1088/0004-637X/772/2/154
View details for Web of Science ID 000322024700076
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THE FERMI ALL-SKY VARIABILITY ANALYSIS: A LIST OF FLARING GAMMA-RAY SOURCES AND THE SEARCH FOR TRANSIENTS IN OUR GALAXY
ASTROPHYSICAL JOURNAL
2013; 771 (1)
View details for DOI 10.1088/0004-637X/771/1/57
View details for Web of Science ID 000321274200057
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DETERMINATION OF THE POINT-SPREAD FUNCTION FOR THE FERMI LARGE AREA TELESCOPE FROM ON-ORBIT DATA AND LIMITS ON PAIR HALOS OF ACTIVE GALACTIC NUCLEI
ASTROPHYSICAL JOURNAL
2013; 765 (1)
View details for DOI 10.1088/0004-637X/765/1/54
View details for Web of Science ID 000314957900054
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Detection of the Characteristic Pion-Decay Signature in Supernova Remnants
SCIENCE
2013; 339 (6121): 807-811
Abstract
Cosmic rays are particles (mostly protons) accelerated to relativistic speeds. Despite wide agreement that supernova remnants (SNRs) are the sources of galactic cosmic rays, unequivocal evidence for the acceleration of protons in these objects is still lacking. When accelerated protons encounter interstellar material, they produce neutral pions, which in turn decay into gamma rays. This offers a compelling way to detect the acceleration sites of protons. The identification of pion-decay gamma rays has been difficult because high-energy electrons also produce gamma rays via bremsstrahlung and inverse Compton scattering. We detected the characteristic pion-decay feature in the gamma-ray spectra of two SNRs, IC 443 and W44, with the Fermi Large Area Telescope. This detection provides direct evidence that cosmic-ray protons are accelerated in SNRs.
View details for DOI 10.1126/science.1231160
View details for Web of Science ID 000314874400045
View details for PubMedID 23413352
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MULTIWAVELENGTH OBSERVATIONS OF GRB 110731A: GeV EMISSION FROM ONSET TO AFTERGLOW
ASTROPHYSICAL JOURNAL
2013; 763 (2)
View details for DOI 10.1088/0004-637X/763/2/71
View details for Web of Science ID 000313869800002
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CONSTRAINTS ON THE GALACTIC HALO DARK MATTER FROM FERMI-LAT DIFFUSE MEASUREMENTS
ASTROPHYSICAL JOURNAL
2012; 761 (2)
View details for DOI 10.1088/0004-637X/761/2/91
View details for Web of Science ID 000312090300010
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Binary Millisecond Pulsar Discovery via Gamma-Ray Pulsations
SCIENCE
2012; 338 (6112): 1314-1317
Abstract
Millisecond pulsars, old neutron stars spun up by accreting matter from a companion star, can reach high rotation rates of hundreds of revolutions per second. Until now, all such "recycled" rotation-powered pulsars have been detected by their spin-modulated radio emission. In a computing-intensive blind search of gamma-ray data from the Fermi Large Area Telescope (with partial constraints from optical data), we detected a 2.5-millisecond pulsar, PSR J1311-3430. This unambiguously explains a formerly unidentified gamma-ray source that had been a decade-long enigma, confirming previous conjectures. The pulsar is in a circular orbit with an orbital period of only 93 minutes, the shortest of any spin-powered pulsar binary ever found.
View details for DOI 10.1126/science.1229054
View details for Web of Science ID 000311991200058
View details for PubMedID 23112297
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The XENON dark matter experiment: status of the XENON 10 phase
ELSEVIER SCIENCE BV. 2012: 376
View details for DOI 10.1016/j.nuclphysbps.2011.10.024
View details for Web of Science ID 000307604300100
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The T2KLAr: a liquid Ar TPC for the T2K experiment
ELSEVIER SCIENCE BV. 2012: 377
View details for DOI 10.1016/j.nuclphysbps.2011.10.025
View details for Web of Science ID 000307604300101
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The Imprint of the Extragalactic Background Light in the Gamma-Ray Spectra of Blazars
SCIENCE
2012; 338 (6111): 1190-1192
Abstract
The light emitted by stars and accreting compact objects through the history of the universe is encoded in the intensity of the extragalactic background light (EBL). Knowledge of the EBL is important to understand the nature of star formation and galaxy evolution, but direct measurements of the EBL are limited by galactic and other foreground emissions. Here, we report an absorption feature seen in the combined spectra of a sample of gamma-ray blazars out to a redshift of z ∼ 1.6. This feature is caused by attenuation of gamma rays by the EBL at optical to ultraviolet frequencies and allowed us to measure the EBL flux density in this frequency band.
View details for DOI 10.1126/science.1227160
View details for Web of Science ID 000311666200040
View details for PubMedID 23118013
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THE FERMI LARGE AREA TELESCOPE ON ORBIT: EVENT CLASSIFICATION, INSTRUMENT RESPONSE FUNCTIONS, AND CALIBRATION
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2012; 203 (1)
View details for DOI 10.1088/0067-0049/203/1/4
View details for Web of Science ID 000310908300004
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FERMI OBSERVATIONS OF gamma-RAY EMISSION FROM THE MOON
ASTROPHYSICAL JOURNAL
2012; 758 (2)
View details for DOI 10.1088/0004-637X/758/2/140
View details for Web of Science ID 000310562000069
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GRB110721A: AN EXTREME PEAK ENERGY AND SIGNATURES OF THE PHOTOSPHERE
ASTROPHYSICAL JOURNAL LETTERS
2012; 757 (2)
View details for DOI 10.1088/2041-8205/757/2/L31
View details for Web of Science ID 000308921700012
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GAMMA-RAY OBSERVATIONS OF THE ORION MOLECULAR CLOUDS WITH THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2012; 756 (1)
View details for DOI 10.1088/0004-637X/756/1/4
View details for Web of Science ID 000309044300004
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GeV OBSERVATIONS OF STAR-FORMING GALAXIES WITH THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2012; 755 (2)
View details for DOI 10.1088/0004-637X/755/2/164
View details for Web of Science ID 000307791400081
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FERMI LARGE AREA TELESCOPE STUDY OF COSMIC RAYS AND THE INTERSTELLAR MEDIUM IN NEARBY MOLECULAR CLOUDS
ASTROPHYSICAL JOURNAL
2012; 755 (1)
View details for DOI 10.1088/0004-637X/755/1/22
View details for Web of Science ID 000306909500022
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CONSTRAINING THE HIGH-ENERGY EMISSION FROM GAMMA-RAY BURSTS WITH FERMI
ASTROPHYSICAL JOURNAL
2012; 754 (2)
View details for DOI 10.1088/0004-637X/754/2/121
View details for Web of Science ID 000306666700042
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Fermi LAT search for dark matter in gamma-ray lines and the inclusive photon spectrum
PHYSICAL REVIEW D
2012; 86 (2)
View details for DOI 10.1103/PhysRevD.86.022002
View details for Web of Science ID 000306193000001
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A STATISTICAL APPROACH TO RECOGNIZING SOURCE CLASSES FOR UNASSOCIATED SOURCES IN THE FIRST FERMI-LAT CATALOG
ASTROPHYSICAL JOURNAL
2012; 753 (1)
View details for DOI 10.1088/0004-637X/753/1/83
View details for Web of Science ID 000305632500083
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MULTI-WAVELENGTH OBSERVATIONS OF BLAZAR AO 0235+164 IN THE 2008-2009 FLARING STATE
ASTROPHYSICAL JOURNAL
2012; 751 (2)
View details for DOI 10.1088/0004-637X/751/2/159
View details for Web of Science ID 000304204600080
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FERMI-LAT OBSERVATIONS OF THE DIFFUSE gamma-RAY EMISSION: IMPLICATIONS FORCOSMIC RAYS AND THE INTERSTELLAR MEDIUM
ASTROPHYSICAL JOURNAL
2012; 750 (1)
View details for DOI 10.1088/0004-637X/750/1/3
View details for Web of Science ID 000303063500003
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Anisotropies in the diffuse gamma-ray background measured by the Fermi LAT
PHYSICAL REVIEW D
2012; 85 (8)
View details for DOI 10.1103/PhysRevD.85.083007
View details for Web of Science ID 000303170000001
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FERMI LARGE AREA TELESCOPE SECOND SOURCE CATALOG
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2012; 199 (2)
View details for DOI 10.1088/0067-0049/199/2/31
View details for Web of Science ID 000303105400007
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FERMI DETECTION OF gamma-RAY EMISSION FROM THE M2 SOFT X-RAY FLARE ON 2010 JUNE 12 (vol 745, pg 144,2012)
ASTROPHYSICAL JOURNAL
2012; 748 (2)
View details for DOI 10.1088/0004-637X/748/2/151
View details for Web of Science ID 000302135200079
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SEARCH FOR DARK MATTER SATELLITES USING FERMI-LAT
ASTROPHYSICAL JOURNAL
2012; 747 (2)
View details for DOI 10.1088/0004-637X/747/2/121
View details for Web of Science ID 000302856400037
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SEARCH FOR GAMMA-RAY EMISSION FROM X-RAY-SELECTED SEYFERT GALAXIES WITH FERMI-LAT
ASTROPHYSICAL JOURNAL
2012; 747 (2)
View details for DOI 10.1088/0004-637X/747/2/104
View details for Web of Science ID 000302856400020
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The cosmic-ray and gas content of the Cygnus region as measured in gamma-rays by the Fermi Large Area Telescope
ASTRONOMY & ASTROPHYSICS
2012; 538
View details for DOI 10.1051/0004-6361/201117539
View details for Web of Science ID 000300614100071
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Limits on large extra dimensions based on observations of neutron stars with the Fermi-LAT
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
2012
View details for DOI 10.1088/1475-7516/2012/02/012
View details for Web of Science ID 000301176000013
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FERMI DETECTION OF gamma-RAY EMISSION FROM THE M2 SOFT X-RAY FLARE ON 2010 JUNE 12f
ASTROPHYSICAL JOURNAL
2012; 745 (2)
View details for DOI 10.1088/0004-637X/745/2/144
View details for Web of Science ID 000300326800042
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Periodic Emission from the Gamma-Ray Binary 1FGL J1018.6-5856
SCIENCE
2012; 335 (6065): 189-193
Abstract
Gamma-ray binaries are stellar systems containing a neutron star or black hole, with gamma-ray emission produced by an interaction between the components. These systems are rare, even though binary evolution models predict dozens in our Galaxy. A search for gamma-ray binaries with the Fermi Large Area Telescope (LAT) shows that 1FGL J1018.6-5856 exhibits intensity and spectral modulation with a 16.6-day period. We identified a variable x-ray counterpart, which shows a sharp maximum coinciding with maximum gamma-ray emission, as well as an O6V((f)) star optical counterpart and a radio counterpart that is also apparently modulated on the orbital period. 1FGL J1018.6-5856 is thus a gamma-ray binary, and its detection suggests the presence of other fainter binaries in the Galaxy.
View details for DOI 10.1126/science.1213974
View details for PubMedID 22246769
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Measurement of Separate Cosmic-Ray Electron and Positron Spectra with the Fermi Large Area Telescope
PHYSICAL REVIEW LETTERS
2012; 108 (1)
Abstract
We measured separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope. Because the instrument does not have an onboard magnet, we distinguish the two species by exploiting Earth's shadow, which is offset in opposite directions for opposite charges due to Earth's magnetic field. We estimate and subtract the cosmic-ray proton background using two different methods that produce consistent results. We report the electron-only spectrum, the positron-only spectrum, and the positron fraction between 20 and 200 GeV. We confirm that the fraction rises with energy in the 20-100 GeV range. The three new spectral points between 100 and 200 GeV are consistent with a fraction that is continuing to rise with energy.
View details for DOI 10.1103/PhysRevLett.108.011103
View details for Web of Science ID 000298928500005
View details for PubMedID 22304252
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In-flight measurement of the absolute energy scale of the Fermi Large Area Telescope
ASTROPARTICLE PHYSICS
2012; 35 (6): 346-353
View details for DOI 10.1016/j.astropartphys.2011.10.007
View details for Web of Science ID 000300760800007
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT G8.7-0.1
ASTROPHYSICAL JOURNAL
2012; 744 (1)
View details for DOI 10.1088/0004-637X/744/1/80
View details for Web of Science ID 000298408300080
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THE SECOND CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2011; 743 (2)
View details for DOI 10.1088/0004-637X/743/2/171
View details for Web of Science ID 000298178400073
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Constraining Dark Matter Models from a Combined Analysis of Milky Way Satellites with the Fermi Large Area Telescope
PHYSICAL REVIEW LETTERS
2011; 107 (24)
Abstract
Satellite galaxies of the Milky Way are among the most promising targets for dark matter searches in gamma rays. We present a search for dark matter consisting of weakly interacting massive particles, applying a joint likelihood analysis to 10 satellite galaxies with 24 months of data of the Fermi Large Area Telescope. No dark matter signal is detected. Including the uncertainty in the dark matter distribution, robust upper limits are placed on dark matter annihilation cross sections. The 95% confidence level upper limits range from about 10(-26) cm3 s(-1) at 5 GeV to about 5×10(-23) cm3 s(-1) at 1 TeV, depending on the dark matter annihilation final state. For the first time, using gamma rays, we are able to rule out models with the most generic cross section (∼3×10(-26) cm3 s(-1) for a purely s-wave cross section), without assuming additional boost factors.
View details for DOI 10.1103/PhysRevLett.107.241302
View details for PubMedID 22242987
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A Cocoon of Freshly Accelerated Cosmic Rays Detected by Fermi in the Cygnus Superbubble
SCIENCE
2011; 334 (6059): 1103-1107
Abstract
The origin of Galactic cosmic rays is a century-long puzzle. Indirect evidence points to their acceleration by supernova shockwaves, but we know little of their escape from the shock and their evolution through the turbulent medium surrounding massive stars. Gamma rays can probe their spreading through the ambient gas and radiation fields. The Fermi Large Area Telescope (LAT) has observed the star-forming region of Cygnus X. The 1- to 100-gigaelectronvolt images reveal a 50-parsec-wide cocoon of freshly accelerated cosmic rays that flood the cavities carved by the stellar winds and ionization fronts from young stellar clusters. It provides an example to study the youth of cosmic rays in a superbubble environment before they merge into the older Galactic population.
View details for DOI 10.1126/science.1210311
View details for PubMedID 22116880
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Fermi Detection of a Luminous gamma-Ray Pulsar in a Globular Cluster
SCIENCE
2011; 334 (6059): 1107-1110
View details for DOI 10.1126/science.1207141
View details for Web of Science ID 000297313900043
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gamma-RAY AND PARSEC-SCALE JET PROPERTIES OF A COMPLETE SAMPLE OF BLAZARS FROM THE MOJAVE PROGRAM
ASTROPHYSICAL JOURNAL
2011; 742 (1)
View details for DOI 10.1088/0004-637X/742/1/27
View details for Web of Science ID 000296783400027
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THE RADIO/GAMMA-RAY CONNECTION IN ACTIVE GALACTIC NUCLEI IN THE ERA OF THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2011; 741 (1)
View details for DOI 10.1088/0004-637X/741/1/30
View details for Web of Science ID 000296769000030
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE ACTIVE GALAXY 4C+55.17: STEADY, HARD GAMMA-RAY EMISSION AND ITS IMPLICATIONS
ASTROPHYSICAL JOURNAL
2011; 738 (2)
View details for DOI 10.1088/0004-637X/738/2/148
View details for Web of Science ID 000294954200030
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Simultaneous multi-wavelength campaign on PKS 2005-489 in a high state
ASTRONOMY & ASTROPHYSICS
2011; 533
View details for DOI 10.1051/0004-6361/201016170
View details for Web of Science ID 000295168100110
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Constraints on dark matter models from a Fermi LAT search for high-energy cosmic-ray electrons from the Sun
PHYSICAL REVIEW D
2011; 84 (3)
View details for DOI 10.1103/PhysRevD.84.032007
View details for Web of Science ID 000293844100001
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF MARKARIAN 421: THE MISSING PIECE OF ITS SPECTRAL ENERGY DISTRIBUTION
ASTROPHYSICAL JOURNAL
2011; 736 (2)
View details for DOI 10.1088/0004-637X/736/2/131
View details for Web of Science ID 000292977400056
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Search for Light Dark Matter in XENON10 Data
PHYSICAL REVIEW LETTERS
2011; 107 (5): 051301
Abstract
We report results of a search for light (≲10 GeV) particle dark matter with the XENON10 detector. The event trigger was sensitive to a single electron, with the analysis threshold of 5 electrons corresponding to 1.4 keV nuclear recoil energy. Considering spin-independent dark matter-nucleon scattering, we exclude cross sections σ(n)>7×10(-42) cm(2), for a dark matter particle mass m(χ)=7 GeV. We find that our data strongly constrain recent elastic dark matter interpretations of excess low-energy events observed by CoGeNT and CRESST-II, as well as the DAMA annual modulation signal.
View details for DOI 10.1103/PhysRevLett.107.051301
View details for Web of Science ID 000293182900003
View details for PubMedID 21867059
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DISCOVERY OF HIGH-ENERGY GAMMA-RAY EMISSION FROM THE BINARY SYSTEM PSR B1259-63/LS 2883 AROUND PERIASTRON WITH FERMI
ASTROPHYSICAL JOURNAL LETTERS
2011; 736 (1)
View details for DOI 10.1088/2041-8205/736/1/L11
View details for Web of Science ID 000293138300011
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF TWO GAMMA-RAY EMISSION COMPONENTS FROM THE QUIESCENT SUN
ASTROPHYSICAL JOURNAL
2011; 734 (2)
View details for DOI 10.1088/0004-637X/734/2/116
View details for Web of Science ID 000291386500044
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DETECTION OF HIGH-ENERGY GAMMA-RAY EMISSION DURING THE X-RAY FLARING ACTIVITY IN GRB 100728A
ASTROPHYSICAL JOURNAL LETTERS
2011; 734 (2)
View details for DOI 10.1088/2041-8205/734/2/L27
View details for Web of Science ID 000293135700002
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OBSERVATIONS OF THE YOUNG SUPERNOVA REMNANT RX J1713.7-3946 WITH THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2011; 734 (1)
View details for DOI 10.1088/0004-637X/734/1/28
View details for Web of Science ID 000291026900028
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FERMI GAMMA-RAY SPACE TELESCOPE OBSERVATIONS OF THE GAMMA-RAY OUTBURST FROM 3C454.3 IN NOVEMBER 2010
ASTROPHYSICAL JOURNAL LETTERS
2011; 733 (2)
View details for DOI 10.1088/2041-8205/733/2/L26
View details for Web of Science ID 000293135000010
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MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER (vol 726, pg 43, 2011)
ASTROPHYSICAL JOURNAL
2011; 731 (1)
View details for DOI 10.1088/0004-637X/731/1/77
View details for Web of Science ID 000289772800077
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Design and performance of the XENON10 dark matter experiment
ASTROPARTICLE PHYSICS
2011; 34 (9): 679–98
View details for DOI 10.1016/j.astropartphys.2011.01.006
View details for Web of Science ID 000289329100005
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THE FIRST FERMI MULTIFREQUENCY CAMPAIGN ON BL LACERTAE: CHARACTERIZING THE LOW-ACTIVITY STATE OF THE EPONYMOUS BLAZAR
ASTROPHYSICAL JOURNAL
2011; 730 (2)
View details for DOI 10.1088/0004-637X/730/2/101
View details for Web of Science ID 000288441900041
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DETECTION OF A SPECTRAL BREAK IN THE EXTRA HARD COMPONENT OF GRB 090926A
ASTROPHYSICAL JOURNAL
2011; 729 (2)
View details for DOI 10.1088/0004-637X/729/2/114
View details for Web of Science ID 000288608700037
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THE FIRST FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS (vol 187, pg 460, 2010)
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2011; 193 (1)
View details for DOI 10.1088/0067-0049/193/1/22
View details for Web of Science ID 000289059000022
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RADIO AND gamma-RAY CONSTRAINTS ON THE EMISSION GEOMETRY AND BIRTHPLACE OF PSR J2043+2740
ASTROPHYSICAL JOURNAL
2011; 728 (2)
View details for DOI 10.1088/0004-637X/728/2/77
View details for Web of Science ID 000286973600004
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Gamma-Ray Flares from the Crab Nebula
SCIENCE
2011; 331 (6018): 739-742
Abstract
A young and energetic pulsar powers the well-known Crab Nebula. Here, we describe two separate gamma-ray (photon energy greater than 100 mega-electron volts) flares from this source detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope. The first flare occurred in February 2009 and lasted approximately 16 days. The second flare was detected in September 2010 and lasted approximately 4 days. During these outbursts, the gamma-ray flux from the nebula increased by factors of four and six, respectively. The brevity of the flares implies that the gamma rays were emitted via synchrotron radiation from peta-electron-volt (10(15) electron volts) electrons in a region smaller than 1.4 × 10(-2) parsecs. These are the highest-energy particles that can be associated with a discrete astronomical source, and they pose challenges to particle acceleration theory.
View details for DOI 10.1126/science.1199705
View details for Web of Science ID 000287205700062
View details for PubMedID 21212321
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INSIGHTS INTO THE HIGH-ENERGY gamma-RAY EMISSION OF MARKARIAN 501 FROM EXTENSIVE MULTIFREQUENCY OBSERVATIONS IN THE FERMI ERA
ASTROPHYSICAL JOURNAL
2011; 727 (2)
View details for DOI 10.1088/0004-637X/727/2/129
View details for Web of Science ID 000286662000068
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CONSTRAINTS ON THE COSMIC-RAY DENSITY GRADIENT BEYOND THE SOLAR CIRCLE FROM FERMI gamma-RAY OBSERVATIONS OF THE THIRD GALACTIC QUADRANT
ASTROPHYSICAL JOURNAL
2011; 726 (2)
View details for DOI 10.1088/0004-637X/726/2/81
View details for Web of Science ID 000285623600025
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MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING GAMMA-RAY BLAZAR 3C 66A IN 2008 OCTOBER
ASTROPHYSICAL JOURNAL
2011; 726 (1)
View details for DOI 10.1088/0004-637X/726/1/43
View details for Web of Science ID 000285411300043
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FERMI-LAT SEARCH FOR PULSAR WIND NEBULAE AROUND GAMMA-RAY PULSARS
ASTROPHYSICAL JOURNAL
2011; 726 (1)
View details for DOI 10.1088/0004-637X/726/1/35
View details for Web of Science ID 000285411300035
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SEARCH FOR GAMMA-RAY EMISSION FROM MAGNETARS WITH THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL LETTERS
2010; 725 (1): L73-L78
View details for DOI 10.1088/2041-8205/725/1/L73
View details for Web of Science ID 000284575400016
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A population of gamma-ray emitting globular clusters seen with the Fermi Large Area Telescope
ASTRONOMY & ASTROPHYSICS
2010; 524
View details for DOI 10.1051/0004-6361/201014458
View details for Web of Science ID 000284625300024
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Searches for cosmic-ray electron anisotropies with the Fermi Large Area Telescope
PHYSICAL REVIEW D
2010; 82 (9)
View details for DOI 10.1103/PhysRevD.82.092003
View details for Web of Science ID 000284402000001
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Fermi LAT observations of cosmic-ray electrons from 7 GeV to 1 TeV
PHYSICAL REVIEW D
2010; 82 (9)
View details for DOI 10.1103/PhysRevD.82.092004
View details for Web of Science ID 000284402000002
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FERMI LARGE AREA TELESCOPE CONSTRAINTS ON THE GAMMA-RAY OPACITY OF THE UNIVERSE
ASTROPHYSICAL JOURNAL
2010; 723 (2): 1082-1096
View details for DOI 10.1088/0004-637X/723/2/1082
View details for Web of Science ID 000284093700011
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Detection of the Small Magellanic Cloud in gamma-rays with Fermi/LAT
ASTRONOMY & ASTROPHYSICS
2010; 523
View details for DOI 10.1051/0004-6361/201014855
View details for Web of Science ID 000285346600050
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FERMI LARGE AREA TELESCOPE OBSERVATION OF A GAMMA-RAY SOURCE AT THE POSITION OF ETA CARINAE
ASTROPHYSICAL JOURNAL
2010; 723 (1): 649-657
View details for DOI 10.1088/0004-637X/723/1/649
View details for Web of Science ID 000284090100057
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Fermi Large Area Telescope observations of Local Group galaxies: detection of M31 and search for M33
ASTRONOMY & ASTROPHYSICS
2010; 523
View details for DOI 10.1051/0004-6361/201015759
View details for Web of Science ID 000285346600003
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FERMI-LAT STUDY OF GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W49B
ASTROPHYSICAL JOURNAL
2010; 722 (2): 1303-1311
View details for DOI 10.1088/0004-637X/722/2/1303
View details for Web of Science ID 000284075400026
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GAMMA-RAY LIGHT CURVES AND VARIABILITY OF BRIGHT FERMI-DETECTED BLAZARS
ASTROPHYSICAL JOURNAL
2010; 722 (1): 520-542
View details for DOI 10.1088/0004-637X/722/1/520
View details for Web of Science ID 000282908900043
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FERMI LARGE AREA TELESCOPE AND MULTI-WAVELENGTH OBSERVATIONS OF THE FLARING ACTIVITY OF PKS 1510-089 BETWEEN 2008 SEPTEMBER AND 2009 JUNE
ASTROPHYSICAL JOURNAL
2010; 721 (2): 1425-1447
View details for DOI 10.1088/0004-637X/721/2/1425
View details for Web of Science ID 000282193600041
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FERMI GAMMA-RAY SPACE TELESCOPE OBSERVATIONS OF GAMMA-RAY OUTBURSTS FROM 3C 454.3 IN 2009 DECEMBER AND 2010 APRIL
ASTROPHYSICAL JOURNAL
2010; 721 (2): 1383-1396
View details for DOI 10.1088/0004-637X/721/2/1383
View details for Web of Science ID 000282193600036
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FERMI-LAT OBSERVATIONS OF THE GEMINGA PULSAR
ASTROPHYSICAL JOURNAL
2010; 720 (1): 272-283
View details for DOI 10.1088/0004-637X/720/1/272
View details for Web of Science ID 000281596000025
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF MISALIGNED ACTIVE GALACTIC NUCLEI
ASTROPHYSICAL JOURNAL
2010; 720 (1): 912-922
View details for DOI 10.1088/0004-637X/720/1/912
View details for Web of Science ID 000281596000077
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF GAMMA-RAY PULSARS PSR J1057-5226, J1709-4429, AND J1952+3252
ASTROPHYSICAL JOURNAL
2010; 720 (1): 26-40
View details for DOI 10.1088/0004-637X/720/1/26
View details for Web of Science ID 000281596000004
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THE FERMI-LAT HIGH-LATITUDE SURVEY: SOURCE COUNT DISTRIBUTIONS AND THE ORIGIN OF THE EXTRAGALACTIC DIFFUSE BACKGROUND
ASTROPHYSICAL JOURNAL
2010; 720 (1): 435-453
View details for DOI 10.1088/0004-637X/720/1/435
View details for Web of Science ID 000281596000037
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FERMI LARGE AREA TELESCOPE VIEW OF THE CORE OF THE RADIO GALAXY CENTAURUS A
ASTROPHYSICAL JOURNAL
2010; 719 (2): 1433-1444
View details for DOI 10.1088/0004-637X/719/2/1433
View details for Web of Science ID 000280658000033
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Gamma-Ray Emission Concurrent with the Nova in the Symbiotic Binary V407 Cygni
SCIENCE
2010; 329 (5993): 817-821
Abstract
Novae are thermonuclear explosions on a white dwarf surface fueled by mass accreted from a companion star. Current physical models posit that shocked expanding gas from the nova shell can produce x-ray emission, but emission at higher energies has not been widely expected. Here, we report the Fermi Large Area Telescope detection of variable gamma-ray emission (0.1 to 10 billion electron volts) from the recently detected optical nova of the symbiotic star V407 Cygni. We propose that the material of the nova shell interacts with the dense ambient medium of the red giant primary and that particles can be accelerated effectively to produce pi(0) decay gamma-rays from proton-proton interactions. Emission involving inverse Compton scattering of the red giant radiation is also considered and is not ruled out.
View details for DOI 10.1126/science.1192537
View details for Web of Science ID 000280809900044
View details for PubMedID 20705855
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE SUPERNOVA REMNANT W28 (G6.4-0.1)
ASTROPHYSICAL JOURNAL
2010; 718 (1): 348-356
View details for DOI 10.1088/0004-637X/718/1/348
View details for Web of Science ID 000280340800029
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FERMI OBSERVATIONS OF HIGH-ENERGY GAMMA-RAY EMISSION FROM GRB 090217A
ASTROPHYSICAL JOURNAL LETTERS
2010; 717 (2): L127-L132
View details for DOI 10.1088/2041-8205/717/2/L127
View details for Web of Science ID 000279430700011
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GeV GAMMA-RAY FLUX UPPER LIMITS FROM CLUSTERS OF GALAXIES
ASTROPHYSICAL JOURNAL LETTERS
2010; 717 (1): L71-L78
View details for DOI 10.1088/2041-8205/717/1/L71
View details for Web of Science ID 000279430600015
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FERMI OBSERVATIONS OF GRB 090510: A SHORT-HARD GAMMA-RAY BURST WITH AN ADDITIONAL, HARD POWER-LAW COMPONENT FROM 10 keV TO GeV ENERGIES
ASTROPHYSICAL JOURNAL
2010; 716 (2): 1178-1190
View details for DOI 10.1088/0004-637X/716/2/1178
View details for Web of Science ID 000278459000022
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THE SPECTRAL ENERGY DISTRIBUTION OF FERMI BRIGHT BLAZARS
ASTROPHYSICAL JOURNAL
2010; 716 (1): 30-70
View details for DOI 10.1088/0004-637X/716/1/30
View details for Web of Science ID 000277960000002
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SUZAKU OBSERVATIONS OF LUMINOUS QUASARS: REVEALING THE NATURE OF HIGH-ENERGY BLAZAR EMISSION IN LOW-LEVEL ACTIVITY STATES
ASTROPHYSICAL JOURNAL
2010; 716 (1): 835-849
View details for DOI 10.1088/0004-637X/716/1/835
View details for Web of Science ID 000277960000064
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FERMI LARGE AREA TELESCOPE FIRST SOURCE CATALOG
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2010; 188 (2): 405-436
View details for DOI 10.1088/0067-0049/188/2/405
View details for Web of Science ID 000278969400004
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THE DISCOVERY OF gamma-RAY EMISSION FROM THE BLAZAR RGB J0710+591
ASTROPHYSICAL JOURNAL LETTERS
2010; 715 (1): L49-L55
View details for DOI 10.1088/2041-8205/715/1/L49
View details for Web of Science ID 000277233200011
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THE FIRST CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2010; 715 (1): 429-457
View details for DOI 10.1088/0004-637X/715/1/429
View details for Web of Science ID 000277216100036
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Fermi Gamma-Ray Imaging of a Radio Galaxy
SCIENCE
2010; 328 (5979): 725-729
Abstract
The Fermi Gamma-ray Space Telescope has detected the gamma-ray glow emanating from the giant radio lobes of the radio galaxy Centaurus A. The resolved gamma-ray image shows the lobes clearly separated from the central active source. In contrast to all other active galaxies detected so far in high-energy gamma-rays, the lobe flux constitutes a considerable portion (greater than one-half) of the total source emission. The gamma-ray emission from the lobes is interpreted as inverse Compton-scattered relic radiation from the cosmic microwave background, with additional contribution at higher energies from the infrared-to-optical extragalactic background light. These measurements provide gamma-ray constraints on the magnetic field and particle energy content in radio galaxy lobes, as well as a promising method to probe the cosmic relic photon fields.
View details for DOI 10.1126/science.1184656
View details for Web of Science ID 000277357100032
View details for PubMedID 20360067
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FERMI-LARGE AREA TELESCOPE OBSERVATIONS OF THE EXCEPTIONAL GAMMA-RAY OUTBURSTS OF 3C 273 IN 2009 SEPTEMBER
ASTROPHYSICAL JOURNAL LETTERS
2010; 714 (1): L73-L78
View details for DOI 10.1088/2041-8205/714/1/L73
View details for Web of Science ID 000276971300015
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Constraints on dark matter annihilation in clusters of galaxies with the Fermi large area telescope
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
2010
View details for DOI 10.1088/1475-7516/2010/05/025
View details for Web of Science ID 000279490800015
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DETECTION OF THE ENERGETIC PULSAR PSR B1509-58 AND ITS PULSAR WIND NEBULA IN MSH 15-52 USING THE FERMI-LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2010; 714 (1): 927-936
View details for DOI 10.1088/0004-637X/714/1/927
View details for Web of Science ID 000276701000076
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE VELA-X PULSAR WIND NEBULA
ASTROPHYSICAL JOURNAL
2010; 713 (1): 146-153
View details for DOI 10.1088/0004-637X/713/1/146
View details for Web of Science ID 000275918500013
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THE VELA PULSAR: RESULTS FROM THE FIRST YEAR OF FERMI LAT OBSERVATIONS
ASTROPHYSICAL JOURNAL
2010; 713 (1): 154-165
View details for DOI 10.1088/0004-637X/713/1/154
View details for Web of Science ID 000275918500014
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF PSR J1836+5925
ASTROPHYSICAL JOURNAL
2010; 712 (2): 1209-1218
View details for DOI 10.1088/0004-637X/712/2/1209
View details for Web of Science ID 000275594600037
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Constraints on cosmological dark matter annihilation from the Fermi-LAT isotropic diffuse gamma-ray measurement
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
2010
View details for DOI 10.1088/1475-7516/2010/04/014
View details for Web of Science ID 000277684600019
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DISCOVERY OF PULSED gamma-RAYS FROM PSR J0034-0534 WITH THE FERMI LARGE AREA TELESCOPE: A CASE FOR CO-LOCATED RADIO AND gamma-RAY EMISSION REGIONS
ASTROPHYSICAL JOURNAL
2010; 712 (2): 957-963
View details for DOI 10.1088/0004-637X/712/2/957
View details for Web of Science ID 000275594600016
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THE FIRST FERMI LARGE AREA TELESCOPE CATALOG OF GAMMA-RAY PULSARS
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2010; 187 (2): 460-494
View details for DOI 10.1088/0067-0049/187/2/460
View details for Web of Science ID 000276841500007
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FERMI DETECTION DELAYED GeV EMISSION FROM THE SHORT GAMMA-RAY BURST 081024B
ASTROPHYSICAL JOURNAL
2010; 712 (1): 558-564
View details for DOI 10.1088/0004-637X/712/1/558
View details for Web of Science ID 000275222900049
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OBSERVATIONS OF MILKY WAY DWARF SPHEROIDAL GALAXIES WITH THE FERMI-LARGE AREA TELESCOPE DETECTOR AND CONSTRAINTS ON DARK MATTER MODELS
ASTROPHYSICAL JOURNAL
2010; 712 (1): 147-158
View details for DOI 10.1088/0004-637X/712/1/147
View details for Web of Science ID 000275222900013
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OBSERVATION OF SUPERNOVA REMNANT IC 443 WITH THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2010; 712 (1): 459-468
View details for DOI 10.1088/0004-637X/712/1/459
View details for Web of Science ID 000275222900041
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Spectrum of the Isotropic Diffuse Gamma-Ray Emission Derived from First-Year Fermi Large Area Telescope Data
PHYSICAL REVIEW LETTERS
2010; 104 (10)
Abstract
We report on the first Fermi Large Area Telescope (LAT) measurements of the so-called "extragalactic" diffuse gamma-ray emission (EGB). This component of the diffuse gamma-ray emission is generally considered to have an isotropic or nearly isotropic distribution on the sky with diverse contributions discussed in the literature. The derivation of the EGB is based on detailed modeling of the bright foreground diffuse Galactic gamma-ray emission, the detected LAT sources, and the solar gamma-ray emission. We find the spectrum of the EGB is consistent with a power law with a differential spectral index gamma = 2.41 +/- 0.05 and intensity I(>100 MeV) = (1.03 +/- 0.17) x 10(-5) cm(-2) s(-1) sr(-1), where the error is systematics dominated. Our EGB spectrum is featureless, less intense, and softer than that derived from EGRET data.
View details for DOI 10.1103/PhysRevLett.104.101101
View details for Web of Science ID 000275543500007
View details for PubMedID 20366411
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Fermi Large Area Telescope Search for Photon Lines from 30 to 200 GeV and Dark Matter Implications
PHYSICAL REVIEW LETTERS
2010; 104 (9)
Abstract
Dark matter (DM) particle annihilation or decay can produce monochromatic gamma rays readily distinguishable from astrophysical sources. gamma-ray line limits from 30 to 200 GeV obtained from 11 months of Fermi Large Area Space Telescope data from 20-300 GeV are presented using a selection based on requirements for a gamma-ray line analysis, and integrated over most of the sky. We obtain gamma-ray line flux upper limits in the range 0.6-4.5x10{-9} cm{-2} s{-1}, and give corresponding DM annihilation cross-section and decay lifetime limits. Theoretical implications are briefly discussed.
View details for DOI 10.1103/PhysRevLett.104.091302
View details for Web of Science ID 000275252500009
View details for PubMedID 20366979
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PSR J1907+0602: A RADIO-FAINT GAMMA-RAY PULSAR POWERING A BRIGHT TeV PULSAR WIND NEBULA
ASTROPHYSICAL JOURNAL
2010; 711 (1): 64-74
View details for DOI 10.1088/0004-637X/711/1/64
View details for Web of Science ID 000274417500006
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Observations of the Large Magellanic Cloud with Fermi
ASTRONOMY & ASTROPHYSICS
2010; 512
View details for DOI 10.1051/0004-6361/200913474
View details for Web of Science ID 000276245500019
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Gamma-Ray Emission from the Shell of Supernova Remnant W44 Revealed by the Fermi LAT
SCIENCE
2010; 327 (5969): 1103-1106
Abstract
Recent observations of supernova remnants (SNRs) hint that they accelerate cosmic rays to energies close to ~10(15) electron volts. However, the nature of the particles that produce the emission remains ambiguous. We report observations of SNR W44 with the Fermi Large Area Telescope at energies between 2 x 10(8) electron volts and 3 x10(11) electron volts. The detection of a source with a morphology corresponding to the SNR shell implies that the emission is produced by particles accelerated there. The gamma-ray spectrum is well modeled with emission from protons and nuclei. Its steepening above approximately 10(9) electron volts provides a probe with which to study how particle acceleration responds to environmental effects such as shock propagation in dense clouds and how accelerated particles are released into interstellar space.
View details for DOI 10.1126/science.1182787
View details for Web of Science ID 000274901100028
View details for PubMedID 20056857
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SPECTRAL PROPERTIES OF BRIGHT FERMI-DETECTED BLAZARS IN THE GAMMA-RAY BAND
ASTROPHYSICAL JOURNAL
2010; 710 (2): 1271-1285
View details for DOI 10.1088/0004-637X/710/2/1271
View details for Web of Science ID 000274233300027
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A change in the optical polarization associated with a gamma-ray flare in the blazar 3C 279
NATURE
2010; 463 (7283): 919-923
Abstract
It is widely accepted that strong and variable radiation detected over all accessible energy bands in a number of active galaxies arises from a relativistic, Doppler-boosted jet pointing close to our line of sight. The size of the emitting zone and the location of this region relative to the central supermassive black hole are, however, poorly known, with estimates ranging from light-hours to a light-year or more. Here we report the coincidence of a gamma (gamma)-ray flare with a dramatic change of optical polarization angle. This provides evidence for co-spatiality of optical and gamma-ray emission regions and indicates a highly ordered jet magnetic field. The results also require a non-axisymmetric structure of the emission zone, implying a curved trajectory for the emitting material within the jet, with the dissipation region located at a considerable distance from the black hole, at about 10(5) gravitational radii.
View details for DOI 10.1038/nature08841
View details for Web of Science ID 000274582700039
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FERMI-LAT DISCOVERY OF GeV GAMMA-RAY EMISSION FROM THE YOUNG SUPERNOVA REMNANT CASSIOPEIA A
ASTROPHYSICAL JOURNAL LETTERS
2010; 710 (1): L92-L97
View details for DOI 10.1088/2041-8205/710/1/L92
View details for Web of Science ID 000274438700020
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PKS 1502+106: A NEW AND DISTANT GAMMA-RAY BLAZAR IN OUTBURST DISCOVERED BY THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2010; 710 (1): 810-827
View details for DOI 10.1088/0004-637X/710/1/810
View details for Web of Science ID 000273850800063
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FERMI OBSERVATIONS OF CASSIOPEIA AND CEPHEUS: DIFFUSE GAMMA-RAY EMISSION IN THE OUTER GALAXY
ASTROPHYSICAL JOURNAL
2010; 710 (1): 133-149
View details for DOI 10.1088/0004-637X/710/1/133
View details for Web of Science ID 000273850800015
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DETECTION OF GAMMA-RAY EMISSION FROM THE STARBURST GALAXIES M82 AND NGC 253 WITH THE LARGE AREA TELESCOPE ON FERMI
ASTROPHYSICAL JOURNAL LETTERS
2010; 709 (2): L152-L157
View details for DOI 10.1088/2041-8205/709/2/L152
View details for Web of Science ID 000274209300013
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SWIFT AND FERMI OBSERVATIONS OF THE EARLY AFTERGLOW OF THE SHORT GAMMA-RAY BURST 090510
ASTROPHYSICAL JOURNAL LETTERS
2010; 709 (2): L146-L151
View details for DOI 10.1088/2041-8205/709/2/L146
View details for Web of Science ID 000274209300012
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE CRAB PULSAR AND NEBULA
ASTROPHYSICAL JOURNAL
2010; 708 (2): 1254-1267
View details for DOI 10.1088/0004-637X/708/2/1254
View details for Web of Science ID 000273021000024
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DISCOVERY OF VERY HIGH ENERGY GAMMA RAYS FROM PKS 1424+240 AND MULTIWAVELENGTH CONSTRAINTS ON ITS REDSHIFT
ASTROPHYSICAL JOURNAL LETTERS
2010; 708 (2): L100-L106
View details for DOI 10.1088/2041-8205/708/2/L100
View details for Web of Science ID 000273308000007
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FERMI OBSERVATIONS OF THE VERY HARD GAMMA-RAY BLAZAR PG 1553+113
ASTROPHYSICAL JOURNAL
2010; 708 (2): 1310-1320
View details for DOI 10.1088/0004-637X/708/2/1310
View details for Web of Science ID 000273021000028
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GAMMA-RAY AND RADIO PROPERTIES OF SIX PULSARS DETECTED BY THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2010; 708 (2): 1426-1441
View details for DOI 10.1088/0004-637X/708/2/1426
View details for Web of Science ID 000273021000038
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FERMI OBSERVATIONS OF TeV-SELECTED ACTIVE GALACTIC NUCLEI
ASTROPHYSICAL JOURNAL
2009; 707 (2): 1310-1333
View details for DOI 10.1088/0004-637X/707/2/1310
View details for Web of Science ID 000272465400039
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RADIO-LOUD NARROW-LINE SEYFERT 1 AS A NEW CLASS OF GAMMA-RAY ACTIVE GALACTIC NUCLEI
ASTROPHYSICAL JOURNAL LETTERS
2009; 707 (2): L142-L147
View details for DOI 10.1088/0004-637X/707/2/L142
View details for Web of Science ID 000272465800008
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Fermi Large Area Telescope Measurements of the Diffuse Gamma-Ray Emission at Intermediate Galactic Latitudes
PHYSICAL REVIEW LETTERS
2009; 103 (25)
Abstract
The diffuse galactic gamma-ray emission is produced by cosmic rays (CRs) interacting with the interstellar gas and radiation field. Measurements by the Energetic Gamma-Ray Experiment Telescope (EGRET) instrument on the Compton Gamma-Ray Observatory indicated excess gamma-ray emission greater, > or approximately equal to 1 GeV relative to diffuse galactic gamma-ray emission models consistent with directly measured CR spectra (the so-called "EGRET GeV excess"). The Large Area Telescope (LAT) instrument on the Fermi Gamma-Ray Space Telescope has measured the diffuse gamma-ray emission with improved sensitivity and resolution compared to EGRET. We report on LAT measurements for energies 100 MeV to 10 GeV and galactic latitudes 10 degrees < or = |b| < or = 20 degrees. The LAT spectrum for this region of the sky is well reproduced by a diffuse galactic gamma-ray emission model that is consistent with local CR spectra and inconsistent with the EGRET GeV excess.
View details for DOI 10.1103/PhysRevLett.103.251101
View details for Web of Science ID 000272958300005
View details for PubMedID 20366246
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Modulated High-Energy Gamma-Ray Emission from the Microquasar Cygnus X-3
SCIENCE
2009; 326 (5959): 1512-1516
Abstract
Microquasars are accreting black holes or neutron stars in binary systems with associated relativistic jets. Despite their frequent outburst activity, they have never been unambiguously detected emitting high-energy gamma rays. The Fermi Large Area Telescope (LAT) has detected a variable high-energy source coinciding with the position of the x-ray binary and microquasar Cygnus X-3. Its identification with Cygnus X-3 is secured by the detection of its orbital period in gamma rays, as well as the correlation of the LAT flux with radio emission from the relativistic jets of Cygnus X-3. The gamma-ray emission probably originates from within the binary system, opening new areas in which to study the formation of relativistic jets.
View details for DOI 10.1126/science.1182174
View details for Web of Science ID 000272623600051
View details for PubMedID 19965378
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MULTIWAVELENGTH MONITORING OF THE ENIGMATIC NARROW-LINE SEYFERT 1 PMN J0948+0022 IN 2009 MARCH-JULY
ASTROPHYSICAL JOURNAL
2009; 707 (1): 727-737
View details for DOI 10.1088/0004-637X/707/1/727
View details for Web of Science ID 000272162900059
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FERMI OBSERVATIONS OF HIGH-ENERGY GAMMA-RAY EMISSION FROM GRB 080825C
ASTROPHYSICAL JOURNAL
2009; 707 (1): 580-592
View details for DOI 10.1088/0004-637X/707/1/580
View details for Web of Science ID 000272162900045
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FERMI LARGE AREA TELESCOPE GAMMA-RAY DETECTION OF THE RADIO GALAXY M87
ASTROPHYSICAL JOURNAL
2009; 707 (1): 55-60
View details for DOI 10.1088/0004-637X/707/1/55
View details for Web of Science ID 000272162900004
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Constraints on inelastic dark matter from XENON10
PHYSICAL REVIEW D
2009; 80 (11)
View details for DOI 10.1103/PhysRevD.80.115005
View details for Web of Science ID 000273233000075
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FERMI LARGE AREA TELESCOPE DETECTION OF PULSED gamma-RAYS FROM THE VELA-LIKE PULSARS PSR J1048-5832 AND PSR J2229+6114
ASTROPHYSICAL JOURNAL
2009; 706 (2): 1331-1340
View details for DOI 10.1088/0004-637X/706/2/1331
View details for Web of Science ID 000271872900032
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Fermi large area telescope observations of the cosmic-ray induced gamma-ray emission of the Earth's atmosphere
PHYSICAL REVIEW D
2009; 80 (12)
View details for DOI 10.1103/PhysRevD.80.122004
View details for Web of Science ID 000273233300010
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FERMI LAT DISCOVERY OF EXTENDED GAMMA-RAY EMISSION IN THE DIRECTION OF SUPERNOVA REMNANT W51C
ASTROPHYSICAL JOURNAL LETTERS
2009; 706 (1): L1-L6
View details for DOI 10.1088/0004-637X/706/1/L1
View details for Web of Science ID 000271533200001
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FERMI OBSERVATIONS OF GRB 090902B: A DISTINCT SPECTRAL COMPONENT IN THE PROMPT AND DELAYED EMISSION
ASTROPHYSICAL JOURNAL LETTERS
2009; 706 (1): L138-L144
View details for DOI 10.1088/0004-637X/706/1/L138
View details for Web of Science ID 000271533200029
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FERMI/LAT OBSERVATIONS OF LS 5039
ASTROPHYSICAL JOURNAL LETTERS
2009; 706 (1): L56-L61
View details for DOI 10.1088/0004-637X/706/1/L56
View details for Web of Science ID 000271533200012
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A limit on the variation of the speed of light arising from quantum gravity effects
NATURE
2009; 462 (7271): 331-334
Abstract
A cornerstone of Einstein's special relativity is Lorentz invariance-the postulate that all observers measure exactly the same speed of light in vacuum, independent of photon-energy. While special relativity assumes that there is no fundamental length-scale associated with such invariance, there is a fundamental scale (the Planck scale, l(Planck) approximately 1.62 x 10(-33) cm or E(Planck) = M(Planck)c(2) approximately 1.22 x 10(19) GeV), at which quantum effects are expected to strongly affect the nature of space-time. There is great interest in the (not yet validated) idea that Lorentz invariance might break near the Planck scale. A key test of such violation of Lorentz invariance is a possible variation of photon speed with energy. Even a tiny variation in photon speed, when accumulated over cosmological light-travel times, may be revealed by observing sharp features in gamma-ray burst (GRB) light-curves. Here we report the detection of emission up to approximately 31 GeV from the distant and short GRB 090510. We find no evidence for the violation of Lorentz invariance, and place a lower limit of 1.2E(Planck) on the scale of a linear energy dependence (or an inverse wavelength dependence), subject to reasonable assumptions about the emission (equivalently we have an upper limit of l(Planck)/1.2 on the length scale of the effect). Our results disfavour quantum-gravity theories in which the quantum nature of space-time on a very small scale linearly alters the speed of light.
View details for DOI 10.1038/nature08574
View details for Web of Science ID 000271899300039
View details for PubMedID 19865083
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The on-orbit calibration of the Fermi Large Area Telescope
ASTROPARTICLE PHYSICS
2009; 32 (3-4): 193-219
View details for DOI 10.1016/j.astropartphys.2009.08.002
View details for Web of Science ID 000272276400005
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The liquid handling systems for the Borexino solar neutrino detector
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
2009; 609 (1): 58-78
View details for DOI 10.1016/j.nima.2009.07.028
View details for Web of Science ID 000271362000007
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FERMI LAT OBSERVATION OF DIFFUSE GAMMA RAYS PRODUCED THROUGH INTERACTIONS BETWEEN LOCAL INTERSTELLAR MATTER AND HIGH-ENERGY COSMIC RAYS
ASTROPHYSICAL JOURNAL
2009; 703 (2): 1249-1256
View details for DOI 10.1088/0004-637X/703/2/1249
View details for Web of Science ID 000269929500007
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FERMI LAT OBSERVATIONS OF LS I+61 degrees 303: FIRST DETECTION OF AN ORBITAL MODULATION IN GeV GAMMA RAYS
ASTROPHYSICAL JOURNAL LETTERS
2009; 701 (2): L123-L128
View details for DOI 10.1088/0004-637X/701/2/L123
View details for Web of Science ID 000268867900014
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Detection of 16 Gamma-Ray Pulsars Through Blind Frequency Searches Using the Fermi LAT
SCIENCE
2009; 325 (5942): 840-844
Abstract
Pulsars are rapidly rotating, highly magnetized neutron stars emitting radiation across the electromagnetic spectrum. Although there are more than 1800 known radio pulsars, until recently only seven were observed to pulse in gamma rays, and these were all discovered at other wavelengths. The Fermi Large Area Telescope (LAT) makes it possible to pinpoint neutron stars through their gamma-ray pulsations. We report the detection of 16 gamma-ray pulsars in blind frequency searches using the LAT. Most of these pulsars are coincident with previously unidentified gamma-ray sources, and many are associated with supernova remnants. Direct detection of gamma-ray pulsars enables studies of emission mechanisms, population statistics, and the energetics of pulsar wind nebulae and supernova remnants.
View details for DOI 10.1126/science.1175558
View details for Web of Science ID 000269242400037
View details for PubMedID 19574346
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Detection of High-Energy Gamma-Ray Emission from the Globular Cluster 47 Tucanae with Fermi
SCIENCE
2009; 325 (5942): 845-848
Abstract
We report the detection of gamma-ray emissions above 200 megaelectron volts at a significance level of 17sigma from the globular cluster 47 Tucanae, using data obtained with the Large Area Telescope onboard the Fermi Gamma-ray Space Telescope. Globular clusters are expected to emit gamma rays because of the large populations of millisecond pulsars that they contain. The spectral shape of 47 Tucanae is consistent with gamma-ray emission from a population of millisecond pulsars. The observed gamma-ray luminosity implies an upper limit of 60 millisecond pulsars present in 47 Tucanae.
View details for DOI 10.1126/science.1177023
View details for Web of Science ID 000269242400038
View details for PubMedID 19679807
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A Population of Gamma-Ray Millisecond Pulsars Seen with the Fermi Large Area Telescope
SCIENCE
2009; 325 (5942): 848-852
Abstract
Pulsars are born with subsecond spin periods and slow by electromagnetic braking for several tens of millions of years, when detectable radiation ceases. A second life can occur for neutron stars in binary systems. They can acquire mass and angular momentum from their companions, to be spun up to millisecond periods and begin radiating again. We searched Fermi Large Area Telescope data for pulsations from all known millisecond pulsars (MSPs) outside of globular clusters, using rotation parameters from radio telescopes. Strong gamma-ray pulsations were detected for eight MSPs. The gamma-ray pulse profiles and spectral properties resemble those of young gamma-ray pulsars. The basic emission mechanism seems to be the same for MSPs and young pulsars, with the emission originating in regions far from the neutron star surface.
View details for DOI 10.1126/science.1176113
View details for Web of Science ID 000269242400039
View details for PubMedID 19574349
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PULSED GAMMA-RAYS FROM PSR J2021+3651 WITH THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2009; 700 (2): 1059-1066
View details for DOI 10.1088/0004-637X/700/2/1059
View details for Web of Science ID 000268098100020
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BRIGHT ACTIVE GALACTIC NUCLEI SOURCE LIST FROM THE FIRST THREE MONTHS OF THE FERMI LARGE AREA TELESCOPE ALL-SKY SURVEY
ASTROPHYSICAL JOURNAL
2009; 700 (1): 597-622
View details for DOI 10.1088/0004-637X/700/1/597
View details for Web of Science ID 000267768900049
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FERMI/LARGE AREA TELESCOPE DISCOVERY OF GAMMA-RAY EMISSION FROM A RELATIVISTIC JET IN THE NARROW-LINE QUASAR PMN J0948+0022
ASTROPHYSICAL JOURNAL
2009; 699 (2): 976-984
View details for DOI 10.1088/0004-637X/699/2/976
View details for Web of Science ID 000267401500008
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DISCOVERY OF PULSATIONS FROM THE PULSAR J0205+6449 IN SNR 3C 58 WITH THE FERMI GAMMA-RAY SPACE TELESCOPE
ASTROPHYSICAL JOURNAL LETTERS
2009; 699 (2): L102-L107
View details for DOI 10.1088/0004-637X/699/2/L102
View details for Web of Science ID 000267372800011
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PULSED GAMMA RAYS FROM THE MILLISECOND PULSAR J0030+0451 WITH THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL
2009; 699 (2): 1171-1177
View details for DOI 10.1088/0004-637X/699/2/1171
View details for Web of Science ID 000267401500026
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FERMI DISCOVERY OF GAMMA-RAY EMISSION FROM NGC 1275
ASTROPHYSICAL JOURNAL
2009; 699 (1): 31-39
View details for DOI 10.1088/0004-637X/699/1/31
View details for Web of Science ID 000267056300004
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EARLY FERMI GAMMA-RAY SPACE TELESCOPE OBSERVATIONS OF THE QUASAR 3C 454.3
ASTROPHYSICAL JOURNAL
2009; 699 (1): 817-823
View details for DOI 10.1088/0004-637X/699/1/817
View details for Web of Science ID 000267056300061
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FERMI/LARGE AREA TELESCOPE BRIGHT GAMMA-RAY SOURCE LIST
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2009; 183 (1): 46-66
View details for DOI 10.1088/0067-0049/183/1/46
View details for Web of Science ID 000267656000004
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THE LARGE AREA TELESCOPE ON THE FERMI GAMMA-RAY SPACE TELESCOPE MISSION
ASTROPHYSICAL JOURNAL
2009; 697 (2): 1071-1102
View details for DOI 10.1088/0004-637X/697/2/1071
View details for Web of Science ID 000266159500012
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FERMI/LARGE AREA TELESCOPE DISCOVERY OF GAMMA-RAY EMISSION FROM THE FLAT-SPECTRUM RADIO QUASAR PKS 1454-354
ASTROPHYSICAL JOURNAL
2009; 697 (1): 934-941
View details for DOI 10.1088/0004-637X/697/1/934
View details for Web of Science ID 000265764000080
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FERMI LARGE AREA TELESCOPE OBSERVATIONS OF THE VELA PULSAR
ASTROPHYSICAL JOURNAL
2009; 696 (2): 1084-1093
View details for DOI 10.1088/0004-637X/696/2/1084
View details for Web of Science ID 000265762700003
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SIMULTANEOUS OBSERVATIONS OF PKS 2155-304 WITH HESS, FERMI, RXTE, AND ATOM: SPECTRAL ENERGY DISTRIBUTIONS AND VARIABILITY IN A LOW STATE
ASTROPHYSICAL JOURNAL LETTERS
2009; 696 (2): L150-L155
View details for DOI 10.1088/0004-637X/696/2/L150
View details for Web of Science ID 000265531500010
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Measurement of the Cosmic Ray e(+)+e(-) Spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
PHYSICAL REVIEW LETTERS
2009; 102 (18)
Abstract
Designed as a high-sensitivity gamma-ray observatory, the Fermi Large Area Telescope is also an electron detector with a large acceptance exceeding 2 m;{2} sr at 300 GeV. Building on the gamma-ray analysis, we have developed an efficient electron detection strategy which provides sufficient background rejection for measurement of the steeply falling electron spectrum up to 1 TeV. Our high precision data show that the electron spectrum falls with energy as E-3.0 and does not exhibit prominent spectral features. Interpretations in terms of a conventional diffusive model as well as a potential local extra component are briefly discussed.
View details for DOI 10.1103/PhysRevLett.102.181101
View details for Web of Science ID 000265948600011
View details for PubMedID 19518855
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DISCOVERY OF PULSED gamma-RAYS FROM THE YOUNG RADIO PULSAR PSR J1028-5819 WITH THE FERMI LARGE AREA TELESCOPE
ASTROPHYSICAL JOURNAL LETTERS
2009; 695 (1): L72-L77
View details for DOI 10.1088/0004-637X/695/1/L72
View details for Web of Science ID 000264539700016
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New measurement of the relative scintillation efficiency of xenon nuclear recoils below 10 keV
PHYSICAL REVIEW C
2009; 79 (4)
View details for DOI 10.1103/PhysRevC.79.045807
View details for Web of Science ID 000266634300071
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The scintillation and ionization yield of liquid xenon for nuclear recoils
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
2009; 601 (3): 339–46
View details for DOI 10.1016/j.nima.2008.12.197
View details for Web of Science ID 000265018200014
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Fermi Observations of High-Energy Gamma-Ray Emission from GRB 080916C
SCIENCE
2009; 323 (5922): 1688-1693
Abstract
Gamma-ray bursts (GRBs) are highly energetic explosions signaling the death of massive stars in distant galaxies. The Gamma-ray Burst Monitor and Large Area Telescope onboard the Fermi Observatory together record GRBs over a broad energy range spanning about 7 decades of gammaray energy. In September 2008, Fermi observed the exceptionally luminous GRB 080916C, with the largest apparent energy release yet measured. The high-energy gamma rays are observed to start later and persist longer than the lower energy photons. A simple spectral form fits the entire GRB spectrum, providing strong constraints on emission models. The known distance of the burst enables placing lower limits on the bulk Lorentz factor of the outflow and on the quantum gravity mass.
View details for DOI 10.1126/science.1169101
View details for Web of Science ID 000264559800029
View details for PubMedID 19228997
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The Borexino detector at the Laboratori Nazionali del Gran Sasso
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
2009; 600 (3): 568-593
View details for DOI 10.1016/j.nima.2008.11.076
View details for Web of Science ID 000264466400007
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The Fermi Gamma-Ray Space Telescope Discovers the Pulsar in the Young Galactic Supernova Remnant CTA 1
SCIENCE
2008; 322 (5905): 1218-1221
Abstract
Energetic young pulsars and expanding blast waves [supernova remnants (SNRs)] are the most visible remains after massive stars, ending their lives, explode in core-collapse supernovae. The Fermi Gamma-Ray Space Telescope has unveiled a radio quiet pulsar located near the center of the compact synchrotron nebula inside the supernova remnant CTA 1. The pulsar, discovered through its gamma-ray pulsations, has a period of 316.86 milliseconds and a period derivative of 3.614 x 10(-13) seconds per second. Its characteristic age of 10(4) years is comparable to that estimated for the SNR. We speculate that most unidentified Galactic gamma-ray sources associated with star-forming regions and SNRs are such young pulsars.
View details for DOI 10.1126/science.1165572
View details for Web of Science ID 000261033400033
View details for PubMedID 18927355
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Limits on spin-dependent WIMP-nucleon cross sections from the XENON10 experiment
PHYSICAL REVIEW LETTERS
2008; 101 (9): 091301
Abstract
XENON10 is an experiment to directly detect weakly interacting massive particles (WIMPs), which may comprise the bulk of the nonbaryonic dark matter in our Universe. We report new results for spin-dependent WIMP-nucleon interactions with 129Xe and 131Xe from 58.6 live days of operation at the Laboratori Nazionali del Gran Sasso. Based on the nonobservation of a WIMP signal in 5.4 kg of fiducial liquid xenon mass, we exclude previously unexplored regions in the theoretically allowed parameter space for neutralinos. We also exclude a heavy Majorana neutrino with a mass in the range of approximately 10 GeV/c2-2 TeV/c2 as a dark matter candidate under standard assumptions for its density and distribution in the galactic halo.
View details for DOI 10.1103/PhysRevLett.101.091301
View details for Web of Science ID 000259195800012
View details for PubMedID 18851599
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Direct measurement of the (7)Be solar neutrino flux with 192 days of Borexino data
PHYSICAL REVIEW LETTERS
2008; 101 (9): 091302
Abstract
We report the direct measurement of the 7Be solar neutrino signal rate performed with the Borexino detector at the Laboratori Nazionali del Gran Sasso. The interaction rate of the 0.862 MeV 7Be neutrinos is 49+/-3stat+/-4syst counts/(day.100 ton). The hypothesis of no oscillation for 7Be solar neutrinos is inconsistent with our measurement at the 4sigma C.L. Our result is the first direct measurement of the survival probability for solar nu(e) in the transition region between matter-enhanced and vacuum-driven oscillations. The measurement improves the experimental determination of the flux of 7Be, pp, and CNO solar nu(e), and the limit on the effective neutrino magnetic moment using solar neutrinos.
View details for DOI 10.1103/PhysRevLett.101.091302
View details for Web of Science ID 000259195800013
View details for PubMedID 18851600
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Search for solar axions emitted in the M1-transition of Li-7*with Borexino CTF
EUROPEAN PHYSICAL JOURNAL C
2008; 54 (1): 61-72
View details for DOI 10.1140/epjc/s10052-008-0530-9
View details for Web of Science ID 000253052700003
- Study of phenylxylylethane (PXE) as scintillator for low energy neutrino experiments NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT