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  4. The Complete CEERS Early Universe Galaxy Sample: A Surprisingly Slow Evolution of the Space Density of Bright Galaxies at z ∼ 8.5-14.5
 
research article

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

Finkelstein, Steven L.
•
Leung, Gene C. K.
•
Bagley, Micaela B.
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July 1, 2024
The Astrophysical Journal Letters

We present a sample of 88 candidate z similar to 8.5-14.5 galaxies selected from the completed NIRCam imaging from the Cosmic Evolution Early Release Science survey. These data cover similar to 90 arcmin2 (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 similar to 9, 11, and 14 and show that the space density of bright (M UV = -20) galaxies changes only modestly from z similar to 14 to z similar to 9, compared to a steeper increase from z similar to 8 to z similar to 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
research article
DOI
10.3847/2041-8213/ad4495
Web of Science ID

WOS:001251660600001

Author(s)
Finkelstein, Steven L.
Leung, Gene C. K.
Bagley, Micaela B.
Dickinson, Mark
Ferguson, Henry C.
Papovich, Casey
Akins, Hollis B.
Haro, Pablo Arrabal
Dave, Romeel
Dekel, Avishai
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Date Issued

2024-07-01

Publisher

Iop Publishing Ltd

Published in
The Astrophysical Journal Letters
Volume

969

Issue

1

Start page

L2

Subjects

Physical Sciences

•

Epoch Simulations Flares

•

Ultraviolet Luminosity Function

•

Initial Mass Function

•

Ly-Alpha Emission

•

Texas Spectroscopic Search

•

Ionizing Photon Escape

•

Active Galactic Nuclei

•

High-Redshift Galaxies

•

Star-Forming Galaxies

•

Greater-Than 8

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GALSPEC  
FunderGrant Number

NASA through STScI ERS award

JWST-ERS-1345

Spanish Ministerio de Ciencia e Innovacion MCIN/AEI

PGC2018-093499-B-I00

ANID Fondecyt

1202007

Available on Infoscience
July 3, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/209150
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