HK
Harley Katz
astro-ph.GAastro-ph.COastro-ph.SRastro-ph.HEastro-ph.IMdiagnostic imaginggr-qcmachine learningNeural Networks, Computerrisk assessment
On Valency
published · living versionsW_unu28bt7·v1 · currentpublished
Why a Multi-Cycle Treasury Program is Essential to Maximize JWST's Scientific Contributions to Galaxy Formation
with Genesis Community, Alice Shapley, Steven L. Finkelstein, Rachel S. Somerville +416
1 version
W_vjn46yac·v1published
Preprints & journals
110 papers in the corpus · 2012–2026MEGATRON: The Physical Origins of Steep UV Slopes at High Redshift2609.36124v1 · Harley Katz, Nicholas Choustikov, Aayush Saxena et al.2026 · 0 citationsarXiv
The AURORA Survey: Determining the Production Mechanism for OI Emission in Star-forming Galaxies at Cosmic Noon2609.32045v1 · Leonardo Clarke, Alice E. Shapley, Zhiwei Shao et al.2026 · 0 citationsarXiv
Chemo-dynamical Analysis of a CNO-Enhanced Ultra Metal-poor Star (): Insights into Early Enrichment by Faint Population III Supernova2609.13373v2 · Guilherme Limberg, Vinicius M. Placco, Alexander P. Ji et al.2026 · 0 citationsarXiv
The Physical Conditions of Low-Mass Galaxies at z=3.5-7.0 from JWST Spectroscopy: The Behaviour of Spectral Line Ratios with Burstiness2609.01205v2 · Ryan A. Cooper, Karina I. Caputi, Alessandro Marconi et al.2026 · 0 citationsarXiv
A gas-enshrouded and gas-reddened black hole at cosmic dawn.42587117 · Naidu, Rohan P, Matthee, Jorryt, Katz, Harley et al.2026 · 26 citationsNature. 2026;656(8127):329-333
mitigating the overcooling problem with sink-based bursty star formation in a high-z dwarf galaxy2607.08846v1 · Cheonsu Kang, Taysun Kimm, Daniel Han et al.2026 · 0 citationsarXiv
How can we finally see the first light? Status and perspective in the search for Population III stars2607.00167v2 · Alessandra Venditti, Daniel Schaerer, Erik Zackrisson et al.2026 · 0 citationsarXiv
Little Red Dots as Intermediate Mass, Super-Eddington Engines: Insights from Type IIn Supernovae and The 1837-1856 Great Eruption of Carinae2606.30711v1 · Rohan P. Naidu, Jorryt Matthee, Anna de Graaff et al.2026 · 0 citationsarXiv
JWST spectroscopy of galaxies at : Damped Ly absorbers reveal efficient star formation and hidden redshift biases2606.30787v1 · Kasper E. Heintz, Clara L. Pollock, Joris Witstok et al.2026 · 0 citationsarXiv
The UV Side of Little Red Dots: Red, Compact, and Iron-Enhanced Rest-UV Emission with a Strong Downturn around Ly2606.03522v1 · Makoto Ando, Yuichi Harikane, Harley Katz et al.2026 · 0 citationsarXiv
RUBIES: The Evolution of the Ionization Parameter from 0 < z < 92605.30410v3 · Nikko J. Cleri, Zach J. Lewis, Joel Leja et al.2026 · 0 citationsarXiv
A Glimpse of the Low-Mass End of the Direct Mass-Metallicity Relation at 2605.06770v1 · Tiger Yu-Yang Hsiao, John Chisholm, Danielle A. Berg et al.2026 · 0 citationsarXiv
From short-lived to long-lived clouds: impact of star formation models on giant molecular cloud evolution in simulations of an NGC 300-like galaxy2604.25911v1 · Daniel Han, Taysun Kimm, Cheonsu Kang et al.2026 · 0 citationsarXiv
SPURS: Evidence for Clumpy Neutral Envelopes and Ionized IGM Surrounding Little Red Dots in Abell 2744 from Ultra-Deep Rest-UV Spectroscopy2604.03563v1 · Mengtao Tang, Daniel P. Stark, Charlotte A. Mason et al.2026 · 2 citationsarXiv
Second Order Closures for the Radiative Transfer Equation: Some Are Unstable2603.22400v2 · Nickolay Y. Gnedin, Harley Katz2026 · 0 citationsOpen Journal of Astrophysics, Vol 9, 2026
The search for Population III: Confirmation of a HeII emitter with no metal lines at z=10.62603.20362v4 · Roberto Maiolino, Hannah Ubler, Michele Perna et al.2026 · 2 citationsarXiv
CALIMA: On-the-fly dust and PAH evolution for radiation-hydrodynamics galaxy formation simulations2602.21790v1 · Francisco Rodr'iguez Montero, Yohan Dubois, Harley Katz et al.2026 · 0 citationsarXiv
Inferring Interstellar Medium Density, Temperature, and Metallicity from Turbulent H II Regions2602.02949v1 · Larrance Xing, Nicholas Choustikov, Harley Katz et al.2026 · 1 citationarXiv
A GLIMPSE into the UV Continuum Slopes of the Faintest Galaxies in the Epoch of Reionization2601.19995v2 · Michelle C. Jecmen, John Chisholm, Hakim Atek et al.2026 · 3 citationsApJ 1001 (2026) 234
The Mass-Metallicity Relation and its Observational Effects at z~3-62512.03134v1 · Zach Lewis, Michael V. Maseda, Anna de Graaff et al.2025 · 0 citationsarXiv
Effect of ionizing photon escape fraction in faint galaxies on modeling reionization history of the universe2511.07543v1 · Zewei Wu, Andrey Kravtsov, Harley Katz2025 · 0 citationsarXiv
Discovery of red galaxy candidates at z ~ 12: Early dust growth or significant nebular emission with high-temperature stars?2510.13240v1 · Ikki Mitsuhashi, Katherine A. Suess, Joel Leja et al.2025 · 0 citationsarXiv
MEGATRON: The environments of Population III stars at Cosmic Dawn and their connection to present day galaxies2510.06853v2 · Anatole Storck, Harley Katz, Julien Devriendt et al.2025 · 4 citationsarXiv
MEGATRON: the impact of non-equilibrium effects and local radiation fields on the circumgalactic medium at cosmic noon2510.05667v3 · Corentin Cadiou, Harley Katz, Martin P. Rey et al.2025 · 0 citationsarXiv
MEGATRON: Disentangling Physical Processes and Observational Bias in the Multi-Phase ISM of High-Redshift Galaxies2510.06347v2 · Nicholas Choustikov, Harley Katz, Alex J. Cameron et al.2025 · 8 citationsarXiv
MEGATRON: Reproducing the Diversity of High-Redshift Galaxy Spectra with Cosmological Radiation Hydrodynamics Simulations2510.05201v2 · Harley Katz, Martin P. Rey, Corentin Cadiou et al.2025 · 1 citationarXiv
MEGATRON: how the first stars can create an iron metallicity plateau in the smallest dwarf galaxies2510.05232v2 · Martin P. Rey, Harley Katz, Corentin Cadiou et al.2025 · 1 citationThe Open Journal of Astrophysics, Vol. 9, 2026 September 30
Declining metallicity and extended HeII in the outflow of an epoch of reionization analogue galaxy2510.05332v1 · M. J. Hamel-Bravo, D. B. Fisher, D. A. Berg et al.2025 · 0 citationsA&A 704, L4 (2025)
Uncertainties in high- galaxy properties inferred from SED fitting using JWST NIRCam photometry2510.00400v2 · Jiyoung Choe, Taysun Kimm, Harley Katz et al.2025 · 1 citationarXiv
H-alpha as a Tracer of Star Formation in the SPHINX Cosmological Simulations2509.05403v2 · I. G. Kramarenko, J. Rosdahl, J. Blaizot et al.2025 · 9 citationsarXiv
The Missing Hard Photons of Little Red Dots: Their Incident Ionizing Spectra Resemble Massive Stars2508.18358v2 · Bingjie Wang, Joel Leja, Harley Katz et al.2025 · 3 citationsarXiv
Impact of Cosmic Ray-driven Outflows on Lyman- Emission in Cosmological Simulations2507.10805v1 · Taysun Kimm, Julien Devriendt, Francesco Rodriguez Montero et al.2025 · 0 citationsarXiv
What Sets the Metallicity of Ultra-Faint Dwarfs?2507.03182v2 · Vance Wheeler, Andrey Kravtsov, Anirudh Chiti et al.2025 · 1 citationarXiv
Breaking Through the Cosmic Fog: JWST/NIRSpec Constraints on Ionizing Photon Escape in Reionization-Era Galaxies2507.01096v1 · Emma Giovinazzo, Pascal A. Oesch, Andrea Weibel et al.2025 · 8 citationsarXiv
A black hole in a near-pristine galaxy 700 million years after the Big Bang2505.22567v6 · Roberto Maiolino, Hannah Uebler, Francesco D'Eugenio et al.2025 · 28 citationsMon Not R Astron Soc (2026)
JWST & ALMA Joint Analysis with [OII]$\lambda\lambda\lambda\mu\mu$m: Multi-Zone Evolution of Electron Densities at and Its Impact on Metallicity Measurements2505.09186v2 · Yuichi Harikane, Ryan L. Sanders, Richard Ellis et al.2025 · 2 citationsarXiv
JWST/NIRSpec Observations of High Ionization Emission Lines in Galaxies at High Redshift2505.06359v2 · Mengtao Tang, Daniel P. Stark, Adele Plat et al.2025 · 18 citationsarXiv
An extremely metal-poor Lyman emitter candidate at revealed through absorption spectroscopy2505.01499v2 · Dominika Durovc'ikov'a, Anna-Christina Eilers, Robert A. Simcoe et al.2025 · 4 citations2025 ApJL 987 L33
A "Black Hole Star" Reveals the Remarkable Gas-Enshrouded Hearts of the Little Red Dots2503.16596v1 · Rohan P. Naidu, Jorryt Matthee, Harley Katz et al.2025 · 19 citationsarXiv
A remarkable Ruby: Absorption in dense gas, rather than evolved stars, drives the extreme Balmer break of a Little Red Dot at 2503.16600v2 · Anna de Graaff, Hans-Walter Rix, Rohan P. Naidu et al.2025 · 76 citationsA&A 701, A168 (2025)
High-z stellar masses can be recovered robustly with JWST photometry2412.02622v1 · R. K. Cochrane, H. Katz, R. Begley et al.2024 · 14 citationsarXiv
Hitting the slopes: A spectroscopic view of UV continuum slopes of galaxies reveals a reddening at z > 9.52411.14532v2 · Aayush Saxena, Alex J. Cameron, Harley Katz et al.2024 · 18 citationsMon Not R Astron Soc (2026)
The Impact of Star Formation and Feedback Recipes on the Stellar Mass and Interstellar Medium of High-Redshift Galaxies2411.07282v2 · Harley Katz, Martin P. Rey, Corentin Cadiou et al.2024 · 6 citationsarXiv
Early Bright Galaxies from Helium Enhancements in High-Redshift Star Clusters2410.14846v3 · Harley Katz, Alexander P. Ji, O. Grace Telford et al.2024 · 4 citationsarXiv
All the Little Things in Abell 2744: $>$1000 Gravitationally Lensed Dwarf Galaxies at from JWST NIRCam Grism Spectroscopy2410.01874v1 · Rohan P. Naidu, Jorryt Matthee, Ivan Kramarenko et al.2024 · 6 citationsarXiv
RUBIES: a complete census of the bright and red distant Universe with JWST/NIRSpec2409.05948v2 · Anna de Graaff, Gabriel Brammer, Andrea Weibel et al.2024 · 114 citationsA&A 697, A189 (2025)
A public grid of radiative transfer simulations for Lyman-alpha and metal lines in idealised galactic outflows2408.03605v2 · Thibault Garel, L'eo Michel-Dansac, Anne Verhamme et al.2024 · 6 citationsA&A 691, A213 (2024)
21 Balmer Jump Street: The Nebular Continuum at High Redshift and Implications for the Bright Galaxy Problem, UV Continuum Slopes, and Early Stellar Populations2408.03189v3 · Harley Katz, Alex J. Cameron, Aayush Saxena et al.2024 · 34 citationsarXiv
Impact of star formation models on the growth of simulated galaxies at high redshifts2407.12090v3 · Cheonsu Kang, Taysun Kimm, Daniel Han et al.2024 · 8 citationsA&A 693, A149 (2025)
Rising from the ashes: evidence of old stellar populations and rejuvenation events in the very early Universe2407.07937v1 · Callum Witten, William McClymont, Nicolas Laporte et al.2024 · 36 citationsarXiv
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