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The Complete CEERS Early Universe Galaxy Sample: A Surprisingly Slow Evolution of the Space Density of Bright Galaxies at z ∼ 8.5–14.5

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Title: The Complete CEERS Early Universe Galaxy Sample: A Surprisingly Slow Evolution of the Space Density of Bright Galaxies at z ∼ 8.5–14.5
Authors: Steven L. Finkelstein, Gene C. K. Leung, Micaela B. Bagley, Mark Dickinson, Henry C. Ferguson, Casey Papovich, Hollis B. Akins, Pablo Arrabal Haro, Romeel Davé, Avishai Dekel, Jeyhan S. Kartaltepe, Dale D. Kocevski, Anton M. Koekemoer, Nor Pirzkal, Rachel S. Somerville, L. Y. Aaron Yung, Ricardo O. Amorín, Bren E. Backhaus, Peter Behroozi, Laura Bisigello, Volker Bromm, Caitlin M. Casey, Óscar A. Chávez Ortiz, Yingjie Cheng, Katherine Chworowsky, Nikko J. Cleri, M. C. Cooper, Kelcey Davis, Alexander de la Vega, David Elbaz, Maximilien Franco, Adriano Fontana, Seiji Fujimoto, Mauro Giavalisco, Norman A. Grogin, Benne W. Holwerda, Marc Huertas-Company, Michaela Hirschmann, Kartheik G. Iyer, Shardha Jogee, Intae Jung, Rebecca L. Larson, Ray A. Lucas, Bahram Mobasher, Alexa M. Morales, Caroline V. Morley, Sagnick Mukherjee, Pablo G. Pérez-González, Swara Ravindranath, Giulia Rodighiero, Melanie J. Rowland, Sandro Tacchella, Anthony J. Taylor, Jonathan R. Trump, Stephen M. Wilkins
Source: The Astrophysical Journal Letters, Vol 969, Iss 1, p L2 (2024)
Publisher Information: IOP Publishing, 2024.
Publication Year: 2024
Collection: LCC:Astrophysics
Subject Terms: Early universe, Galaxy formation, Galaxy evolution, Luminosity function, Astrophysics, QB460-466
More Details: We present a sample of 88 candidate z ∼ 8.5–14.5 galaxies selected from the completed NIRCam imaging from the Cosmic Evolution Early Release Science survey. These data cover ∼90 arcmin ^2 (10 NIRCam pointings) in six broadband imaging filters and one medium-band imaging filter. With this sample we confirm at higher confidence early JWST conclusions that bright galaxies in this epoch are more abundant than predicted by most theoretical models. We construct the rest-frame ultraviolet luminosity functions at z ∼ 9, 11, and 14 and show that the space density of bright ( M _UV = −20) galaxies changes only modestly from z ∼ 14 to z ∼ 9, compared to a steeper increase from z ∼ 8 to z ∼ 4. While our candidates are photometrically selected, spectroscopic follow-up has now confirmed 13 of them, with only one significant interloper, implying that the fidelity of this sample is high. Successfully explaining the evidence for a flatter evolution in the number densities of UV-bright z > 10 galaxies may thus require changes to the dominant physical processes regulating star formation. While our results indicate that significant variations of dust attenuation with redshift are unlikely to be the dominant factor at these high redshifts, they are consistent with predictions from models that naturally have enhanced star formation efficiency and/or stochasticity. An evolving stellar initial mass function could also bring model predictions into better agreement with our results. Deep spectroscopic follow-up of a large sample of early galaxies can distinguish between these competing scenarios.
Document Type: article
File Description: electronic resource
Language: English
ISSN: 2041-8213
2041-8205
Relation: https://doaj.org/toc/2041-8205
DOI: 10.3847/2041-8213/ad4495
Access URL: https://doaj.org/article/40b7d7b855d545cf968f547fc84c3089
Accession Number: edsdoj.40b7d7b855d545cf968f547fc84c3089
Database: Directory of Open Access Journals
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  Data: We present a sample of 88 candidate z ∼ 8.5–14.5 galaxies selected from the completed NIRCam imaging from the Cosmic Evolution Early Release Science survey. These data cover ∼90 arcmin ^2 (10 NIRCam pointings) in six broadband imaging filters and one medium-band imaging filter. With this sample we confirm at higher confidence early JWST conclusions that bright galaxies in this epoch are more abundant than predicted by most theoretical models. We construct the rest-frame ultraviolet luminosity functions at z ∼ 9, 11, and 14 and show that the space density of bright ( M _UV = −20) galaxies changes only modestly from z ∼ 14 to z ∼ 9, compared to a steeper increase from z ∼ 8 to z ∼ 4. While our candidates are photometrically selected, spectroscopic follow-up has now confirmed 13 of them, with only one significant interloper, implying that the fidelity of this sample is high. Successfully explaining the evidence for a flatter evolution in the number densities of UV-bright z > 10 galaxies may thus require changes to the dominant physical processes regulating star formation. While our results indicate that significant variations of dust attenuation with redshift are unlikely to be the dominant factor at these high redshifts, they are consistent with predictions from models that naturally have enhanced star formation efficiency and/or stochasticity. An evolving stellar initial mass function could also bring model predictions into better agreement with our results. Deep spectroscopic follow-up of a large sample of early galaxies can distinguish between these competing scenarios.
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            – Type: issue
              Value: 1
          Titles:
            – TitleFull: The Astrophysical Journal Letters
              Type: main
ResultId 1