Katherine Anne Suess
Physical Science Research Scientist
Kavli Institute for Particle Astrophysics and Cosmology
Academic Appointments
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Physical Science Research Scientist, Kavli Institute for Particle Astrophysics and Cosmology
All Publications
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The Heavy Metal Survey: Star Formation Constraints and Dynamical Masses of 21 Massive Quiescent Galaxies at <i>z</i>=1.3-2.3
ASTROPHYSICAL JOURNAL
2024; 966 (1)
View details for DOI 10.3847/1538-4357/ad2df9
View details for Web of Science ID 001207490600001
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The Heavy Metal Survey: The Evolution of Stellar Metallicities, Abundance Ratios, and Ages of Massive Quiescent Galaxies since <i>z</i> ∼ 2
ASTROPHYSICAL JOURNAL
2024; 966 (2)
View details for DOI 10.3847/1538-4357/ad372d
View details for Web of Science ID 001219448700001
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Ionised gas kinematics and dynamical masses of <i>z</i> ≳ 6 galaxies from JADES/NIRSpec high-resolution spectroscopy
ASTRONOMY & ASTROPHYSICS
2024; 684
View details for DOI 10.1051/0004-6361/202347755
View details for Web of Science ID 001198960100018
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A recently quenched galaxy 700 million years after the Big Bang.
Nature
2024
Abstract
Local and low-redshift (z<3) galaxies are known to broadly follow a bimodal distribution: actively star forming galaxies with relatively stable star-formation rates, and passive systems. These two populations are connected by galaxies in relatively slow transition. In contrast, theory predicts that star formation was stochastic at early cosmic times and in low-mass systems 1-4: these galaxies transitioned rapidly between starburst episodes and phases of suppressed star formation, potentially even causing temporary quiescence -so-called mini-quenching events 5,6. However, the regime of star-formation burstiness is observationally highly unconstrained. Directly observing mini-quenched galaxies in the primordial Universe is therefore of utmost importance to constrain models of galaxy formation and transformation 7,8. Early quenched galaxies have been identified out to redshift z < 5 [e.g. 9-12], and these are all found to be massive (M⋆ > 1010 M⊙) and relatively old. Here we report a (mini-)quenched galaxy at z=7.3, when the Universe was only 700 Myr old. The JWST/NIRSpec spectrum is very blue (UV =0.16 ± 0.03 mag), but exhibits a Balmer break and no nebular emission lines. The galaxy experienced a short starburst followed by rapid quenching; its stellar mass (4-6×108 M⊙) falls in a range that is sensitive to various feedback mechanisms, which can result in perhaps only temporary quenching.
View details for DOI 10.1038/s41586-024-07227-0
View details for PubMedID 38447669
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The Cosmos in Its Infancy: JADES Galaxy Candidates at <i>z</i> > 8 in GOODS-S and GOODS-N
ASTROPHYSICAL JOURNAL
2024; 964 (1)
View details for DOI 10.3847/1538-4357/ad1ee4
View details for Web of Science ID 001186825000001
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Remarkably Compact Quiescent Candidates at 3 < <i>z</i> < 5 in JWST-CEERS
ASTROPHYSICAL JOURNAL LETTERS
2024; 964 (1)
View details for DOI 10.3847/2041-8213/ad2b6d
View details for Web of Science ID 001185105400001
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Dwarf-Dwarf Interactions Can Both Trigger and Quench Star Formation
ASTROPHYSICAL JOURNAL
2024; 963 (1)
View details for DOI 10.3847/1538-4357/ad18cb
View details for Web of Science ID 001178418100001
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Quantifying the Effects of Known Unknowns on Inferred High-redshift Galaxy Properties: Burstiness, IMF, and Nebular Physics
ASTROPHYSICAL JOURNAL
2024; 963 (1)
View details for DOI 10.3847/1538-4357/ad187c
View details for Web of Science ID 001175706900001
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Most of the photons that reionized the Universe came from dwarf galaxies.
Nature
2024; 626 (8001): 975-978
Abstract
The identification of sources driving cosmic reionization, a major phase transition from neutral hydrogen to ionized plasma around 600-800 Myr after the Big Bang1-3, has been a matter of debate4. Some models suggest that high ionizing emissivity and escape fractions (fesc) from quasars support their role in driving cosmic reionization5,6. Others propose that the high fesc values from bright galaxies generate sufficient ionizing radiation to drive this process7. Finally, a few studies suggest that the number density of faint galaxies, when combined with a stellar-mass-dependent model of ionizing efficiency and fesc, can effectively dominate cosmic reionization8,9. However, so far, comprehensive spectroscopic studies of low-mass galaxies have not been done because of their extreme faintness. Here we report an analysis of eight ultra-faint galaxies (in a very small field) during the epoch of reionization with absolute magnitudes between MUV ≈ -17 mag and -15 mag (down to 0.005L⋆ (refs. 10,11)). We find that faint galaxies during the first thousand million years of the Universe produce ionizing photons with log[ξion (Hz erg-1)] = 25.80 ± 0.14, a factor of 4 higher than commonly assumed values12. If this field is representative of the large-scale distribution of faint galaxies, the rate of ionizing photons exceeds that needed for reionization, even for escape fractions of the order of 5%.
View details for DOI 10.1038/s41586-024-07043-6
View details for PubMedID 38418911
View details for PubMedCentralID 7759461
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The UNCOVER Survey: A First-look HST plus JWST Catalog of Galaxy Redshifts and Stellar Population Properties Spanning 0.2 ≲ <i>z</i> ≲ 15
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2024; 270 (1)
View details for DOI 10.3847/1538-4365/ad0846
View details for Web of Science ID 001133735200001
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JADES Initial Data Release for the Hubble Ultra Deep Field: Revealing the Faint Infrared Sky with Deep JWST NIRCam Imaging
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2023; 269 (1)
View details for DOI 10.3847/1538-4365/acf44d
View details for Web of Science ID 001100952300001
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Rest-frame Near-infrared Radial Light Profiles up to <i>z</i>=3 from JWST/NIRCam: Wavelength Dependence of the Sérsic Index
ASTROPHYSICAL JOURNAL
2023; 957 (1)
View details for DOI 10.3847/1538-4357/acf716
View details for Web of Science ID 001122334500001
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Minor Merger Growth in Action: JWST Detects Faint Blue Companions around Massive Quiescent Galaxies at 0.5 ≤ <i>z</i> ≤ 3.0
ASTROPHYSICAL JOURNAL LETTERS
2023; 956 (2)
View details for DOI 10.3847/2041-8213/acf5e6
View details for Web of Science ID 001100562800001
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JEMS: A Deep Medium-band Imaging Survey in the Hubble Ultra Deep Field with JWST NIRCam and NIRISS
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
2023; 268 (2)
View details for DOI 10.3847/1538-4365/acf130
View details for Web of Science ID 001083333800001
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Sizes and Mass Profiles of Candidate Massive Galaxies Discovered by JWST at 7 < <i>z</i> < 9: Evidence for Very Early Formation of the Central ∼100 pc of Present-day Ellipticals
ASTROPHYSICAL JOURNAL LETTERS
2023; 955 (1)
View details for DOI 10.3847/2041-8213/acf5ef
View details for Web of Science ID 001072163100001
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Stars, Gas, and Star Formation of Distant Post-starburst Galaxies
ASTROPHYSICAL JOURNAL
2023; 955 (1)
View details for DOI 10.3847/1538-4357/acf0bd
View details for Web of Science ID 001069149000001
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As Simple as Possible but No Simpler: Optimizing the Performance of Neural Net Emulators for Galaxy SED Fitting
ASTROPHYSICAL JOURNAL
2023; 954 (2)
View details for DOI 10.3847/1538-4357/ace720
View details for Web of Science ID 001057365900001
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JWST UNCOVER: Extremely Red and Compact Object at <i>z</i> <sub>phot</sub> ≃ 7.6 Triply Imaged by A2744
ASTROPHYSICAL JOURNAL
2023; 952 (2)
View details for DOI 10.3847/1538-4357/acdc9d
View details for Web of Science ID 001036946900001
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JADES Imaging of GN-z11: Revealing the Morphology and Environment of a Luminous Galaxy 430Myr after the Big Bang
ASTROPHYSICAL JOURNAL
2023; 952 (1)
View details for DOI 10.3847/1538-4357/acdbc6
View details for Web of Science ID 001033732400001
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JWST NIRCam plus NIRSpec: interstellar medium and stellar populations of young galaxies with rising star formation and evolving gas reservoirs
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2023; 522 (4): 6236-6249
View details for DOI 10.1093/mnras/stad1408
View details for Web of Science ID 000994685100036
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A variable active galactic nucleus at z=2.06 triply-imaged by the galaxy cluster MACS J0035.4-2015
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2023; 522 (4): 5142-5151
View details for DOI 10.1093/mnras/stad1321
View details for Web of Science ID 000999132000012
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JWST Reveals a Population of Ultrared, Flattened Galaxies at 2 less than or similar to z less than or similar to 6 Previously Missed by HST
ASTROPHYSICAL JOURNAL LETTERS
2023; 948 (2)
View details for DOI 10.3847/2041-8213/acc1e1
View details for Web of Science ID 000992470400001
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Merger Signatures are Common, but not Universal, in Massive, Recently Quenched Galaxies at z similar to 0.7
ASTROPHYSICAL JOURNAL
2023; 949 (1)
View details for DOI 10.3847/1538-4357/acc38b
View details for Web of Science ID 000992082100001
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Spatially Resolved Properties of Galaxies at 5 < z < 9 in the SMACS 0723 JWST ERO Field
ASTROPHYSICAL JOURNAL
2023; 948 (2)
View details for DOI 10.3847/1538-4357/acc5ea
View details for Web of Science ID 000988222000001
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The first quiescent galaxies in TNG300
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
2023; 522 (2): 3138-3144
View details for DOI 10.1093/mnras/stad1162
View details for Web of Science ID 000999174800012
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Spectroscopic confirmation of four metal-poor galaxies at z=10.3-13.2
NATURE ASTRONOMY
2023
View details for DOI 10.1038/s41550-023-01918-w
View details for Web of Science ID 000966773800004
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Identification and properties of intense star-forming galaxies at redshifts <i>z</i> > 10
NATURE ASTRONOMY
2023; 7 (5): 611-+
View details for DOI 10.1038/s41550-023-01921-1
View details for Web of Science ID 000966773800003
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A population of red candidate massive galaxies ~600 Myr after the Big Bang.
Nature
2023
Abstract
Galaxies with stellar masses as high as ~ 1011 solar masses have been identified1-3 out to redshifts z ~ 6, approximately one billion years after the Big Bang. It has been difficult to find massive galaxies at even earlier times, as the Balmer break region, which is needed for accurate mass estimates, is redshifted to wavelengths beyond 2.5 μm. Here we make use of the 1-5 μm coverage of the JWST early release observations to search for intrinsically red galaxies in the first ≈ 750 million years of cosmic history. In the survey area, we find six candidate massive galaxies (stellar mass > 1010 solar masses) at 7.4 ≤ z ≤ 9.1, 500-700 Myr after the Big Bang, including one galaxy with a possible stellar mass of ~1011 solar masses. If verified with spectroscopy, the stellar mass density in massive galaxies would be much higher than anticipated from previous studies based on rest-frame ultraviolet-selected samples.
View details for DOI 10.1038/s41586-023-05786-2
View details for PubMedID 36812940
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Early JWST Imaging Reveals Strong Optical and NIR Color Gradients in Galaxies at z similar to 2 Driven Mostly by Dust
ASTROPHYSICAL JOURNAL LETTERS
2022; 941 (2)
View details for DOI 10.3847/2041-8213/aca675
View details for Web of Science ID 000903423500001
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Two Remarkably Luminous Galaxy Candidates at z & AP; 10-12 Revealed by JWST
ASTROPHYSICAL JOURNAL LETTERS
2022; 940 (1)
View details for DOI 10.3847/2041-8213/ac9b22
View details for Web of Science ID 000886669700001
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Rest-frame Near-infrared Sizes of Galaxies at Cosmic Noon: Objects in JWST's Mirror Are Smaller than They Appeared
ASTROPHYSICAL JOURNAL LETTERS
2022; 937 (2)
View details for DOI 10.3847/2041-8213/ac8e06
View details for Web of Science ID 000861011300001
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Star Formation Suppression by Tidal Removal of Cold Molecular Gas from an Intermediate-redshift Massive Post-starburst Galaxy
ASTROPHYSICAL JOURNAL LETTERS
2022; 936 (1)
View details for DOI 10.3847/2041-8213/ac75ea
View details for Web of Science ID 000847569300001
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Recovering the Star Formation Histories of Recently Quenched Galaxies: The Impact of Model and Prior Choices
ASTROPHYSICAL JOURNAL
2022; 935 (2)
View details for DOI 10.3847/1538-4357/ac82b0
View details for Web of Science ID 000843295700001
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SQuIGGLE: Studying Quenching in Intermediate-z Galaxies- Gas,. AnguLar Momentum, and Evolution (vol 926, 89 2022)
ASTROPHYSICAL JOURNAL
2022; 931 (1)
View details for DOI 10.3847/1538-4357/ac6dde
View details for Web of Science ID 000800003300001
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The Compact Structures of Massive z similar to 0.7 Post-starburst Galaxies in the SQuIGG(L)over-right-arrowE Sample
ASTROPHYSICAL JOURNAL
2022; 931 (1)
View details for DOI 10.3847/1538-4357/ac6096
View details for Web of Science ID 000801043800001
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SQuIGG(L)over-right-arrowE: Studying Quenching in Intermediate-z Galaxies-Gas, Angu(L)over-right-arrowar Momentum, and Evolution
ASTROPHYSICAL JOURNAL
2022; 926 (1)
View details for DOI 10.3847/1538-4357/ac404a
View details for Web of Science ID 000756011700001
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Now You See It, Now You Don't: Star Formation Truncation Precedes the Loss of Molecular Gas by similar to 100 Myr in Massive Poststarburst Galaxies at z similar to 0.6
ASTROPHYSICAL JOURNAL
2022; 925 (2)
View details for DOI 10.3847/1538-4357/ac3dfa
View details for Web of Science ID 000749818900001