Peter Michelson, Postdoctoral Faculty Sponsor
- An observation-simulation and analysis framework for the Imaging X-ray Polarimetry Explorer (IXPE) NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 2019; 936: 224–26
Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
2018; 361 (6398): 146-+
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
- Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar SCIENCE ADVANCES 2018; 4 (2)
- The Imaging X-ray Polarimetry Explorer (IXPE): technical overview SPIE-INT SOC OPTICAL ENGINEERING. 2018
Einstein@Home discovers a radio-quiet gamma-ray millisecond pulsar.
2018; 4 (2): eaao7228
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 PubMedID 29503868
- XIMPOL: a new x-ray polarimetry observation-simulation and analysis framework. SPIE-INT SOC OPTICAL ENGINEERING. 2017