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Inferring the ionizing photon contributions of high-redshift galaxies to reionization with JWST NIRCam photometry

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025) staf126

Authors:

Nicholas Choustikov, Richard Stiskalek, Aayush Saxena, Harley Katz, Julien Devriendt, Adrianne Slyz
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Forty years of the Ellis-Baldwin test

(2025)

Authors:

Nathan Secrest, Sebastian von Hausegger, Mohamed Rameez, Roya Mohayaee, Subir Sarkar
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Forty years of the Ellis–Baldwin test

Nature Reviews Physics Springer Nature (2025)

Authors:

Nathan Secrest, Sebastian von Hausegger, Mohamed Rameez, Roya Mohayaee, Subir Sarkar

Abstract:

Modern cosmology is built on the assumption that the Universe is homogeneous and isotropic on large scales — but this is challenged by results of the Ellis–Baldwin test that show an unexplained anomaly in the distribution of distant galaxies and quasars.
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HETDEX-LOFAR Spectroscopic Redshift Catalog

The Astrophysical Journal American Astronomical Society 978:1 (2025) 101

Authors:

Maya H Debski, Gregory R Zeimann, Gary J Hill, Donald P Schneider, Leah Morabito, Gavin Dalton, Matt J Jarvis, Erin Mentuch Cooper, Robin Ciardullo, Eric Gawiser, Nika Jurlin
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Photometric detection at 7.7 μm of a galaxy beyond redshift 14 with JWST/MIRI.

Nat Astron 9:5 (2025) 729-740

Authors:

Jakob M Helton, George H Rieke, Stacey Alberts, Zihao Wu, Daniel J Eisenstein, Kevin N Hainline, Stefano Carniani, Zhiyuan Ji, William M Baker, Rachana Bhatawdekar, Andrew J Bunker, Phillip A Cargile, Stéphane Charlot, Jacopo Chevallard, Francesco D'Eugenio, Eiichi Egami, Benjamin D Johnson, Gareth C Jones, Jianwei Lyu, Roberto Maiolino, Pablo G Pérez-González, Marcia J Rieke, Brant Robertson, Aayush Saxena, Jan Scholtz, Irene Shivaei, Fengwu Sun, Sandro Tacchella, Lily Whitler, Christina C Williams, Christopher NA Willmer, Chris Willott, Joris Witstok, Yongda Zhu

Abstract:

The James Webb Space Telescope (JWST) has spectroscopically confirmed numerous galaxies at z > 10. While weak rest-frame ultraviolet emission lines have only been seen in a handful of sources, the stronger rest-frame optical emission lines are highly diagnostic and accessible at mid-infrared wavelengths with the Mid-Infrared Instrument (MIRI) of JWST. We report the photometric detection of the distant spectroscopically confirmed galaxy JADES-GS-z14-0 at z = 14.3 2 - 0.20 + 0.08 with MIRI at 7.7 μm. The most plausible solution for the stellar-population properties is that this galaxy contains half a billion solar masses in stars with a strong burst of star formation in the most recent few million years. For this model, at least one-third of the flux at 7.7 μm originates from the rest-frame optical emission lines Hβ and/or [O iii]λ λ4959, 5007. The inferred properties of JADES-GS-z14-0 suggest rapid mass assembly and metal enrichment during the earliest phases of galaxy formation. This work demonstrates the unique power of mid-infrared observations in understanding galaxies at the redshift frontier.
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