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  4. Two Massive, Compact, and Dust-obscured Candidate <i>z</i> ≃ 8 Galaxies Discovered by JWST
 
research article

Two Massive, Compact, and Dust-obscured Candidate z ≃ 8 Galaxies Discovered by JWST

Akins, Hollis B.
•
Casey, Caitlin M.
•
Allen, Natalie
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October 1, 2023
The Astrophysical Journal

We present a search for extremely red, dust-obscured, z > 7 galaxies with JWST/NIRCam+MIRI imaging over the first 20 arcmin(2) of publicly available Cycle 1 data from the COSMOS-Web, CEERS, and PRIMER surveys. Based on their red color in F277W-F444W (similar to 2.5 mag) and detection in MIRI/F770W (similar to 25 mag), we identify two galaxies, COS-z8M1 and CEERS-z7M1, that have best-fit photometric redshifts of z = 8.4(-0.4)(+0.3) and 7.6(-0.1)(+0.1), respectively. We perform spectral energy distribution fitting with a variety of codes (including BAGPIPES, PROSPECTOR, BEAGLE, and CIGALE) and find a >95% probability that these indeed lie at z > 7. Both sources are compact (R-eff less than or similar to 200 pc) and highly obscured (A(V) similar to 1.5-2.5) and, at our best-fit redshift estimates, likely have strong [O III]+H beta emission contributing to their 4.4 mu m photometry. We estimate stellar masses of similar to 10(10) M-circle dot for both sources; by virtue of detection in MIRI at 7.7 mu m, these measurements are robust to the inclusion of bright emission lines, for example, from an active galactic nucleus. We identify a marginal (2.9 sigma) Atacama Large Millimeter/submillimeter Array detection at 2 mm within 0 ''.5 of COS-z8M1, which, if real, would suggest a remarkably high IR luminosity of similar to 10(12) L-circle dot. These two galaxies, if confirmed at z similar to 8, would be extreme in their stellar and dust masses and may be representative of a substantial population of highly dust-obscured galaxies at cosmic dawn.

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Type
research article
DOI
10.3847/1538-4357/acef21
Web of Science ID

WOS:001083924000001

Author(s)
Akins, Hollis B.
Casey, Caitlin M.
Allen, Natalie
Bagley, Micaela B.
Dickinson, Mark
Finkelstein, Steven L.
Franco, Maximilien
Harish, Santosh
Haro, Pablo Arrabal
Ilbert, Olivier
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Corporate authors
COSMOS-Web Team
•
CEERS Team
Date Issued

2023-10-01

Publisher

Iop Publishing Ltd

Published in
The Astrophysical Journal
Volume

956

Issue

1

Start page

61

Subjects

Physical Sciences

•

Spectral Energy-Distributions

•

Stellar Population Synthesis

•

Space-Telescope Observations

•

Star-Formation History

•

High-Redshift Galaxies

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Broad-Band Photometry

•

Lyman-Break Galaxies

•

High-Z Exploration

•

Luminosity Function

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Emission-Lines

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GALSPEC  
FunderGrant Number

NASA

JWST-GO-01727

Space Telescope Science Institute

Harrington Graduate Fellowship

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Available on Infoscience
February 16, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/203865
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