Two Massive, Compact, and Dust-obscured Candidate z ≃ 8 Galaxies Discovered by JWST
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Published:2023-10-01
Issue:1
Volume:956
Page:61
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ISSN:0004-637X
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Container-title:The Astrophysical Journal
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language:
-
Short-container-title:ApJ
Author:
Akins Hollis B.ORCID, Casey Caitlin M.ORCID, Allen NatalieORCID, Bagley Micaela B.ORCID, Dickinson MarkORCID, Finkelstein Steven L.ORCID, Franco MaximilienORCID, Harish SantoshORCID, Arrabal Haro PabloORCID, Ilbert OlivierORCID, Kartaltepe Jeyhan S.ORCID, Koekemoer Anton M.ORCID, Liu DaizhongORCID, Long Arianna S.ORCID, McCracken Henry JoyORCID, Paquereau LouiseORCID, Papovich CaseyORCID, Pirzkal NorORCID, Rhodes JasonORCID, Robertson Brant E.ORCID, Shuntov MarkoORCID, Toft SuneORCID, Yang GuangORCID, Barro GuillermoORCID, Bisigello LauraORCID, Buat VéroniqueORCID, Champagne Jaclyn B.ORCID, Cooper OliviaORCID, Costantin LucaORCID, de la Vega AlexanderORCID, Drakos Nicole E.ORCID, Faisst AndreasORCID, Fontana AdrianoORCID, Fujimoto Seiji, Gillman StevenORCID, Gómez-Guijarro CarlosORCID, Gozaliasl GhassemORCID, Hathi Nimish P.ORCID, Hayward Christopher C.ORCID, Hirschmann MichaelaORCID, Holwerda Benne W.ORCID, Jin ShuowenORCID, Kocevski Dale D.ORCID, Kokorev VasilyORCID, Lambrides EriniORCID, Lucas Ray A.ORCID, Magdis Georgios E.ORCID, Magnelli BenjaminORCID, McKinney JedORCID, Mobasher BahramORCID, Pérez-González Pablo G.ORCID, Rich R. MichaelORCID, Seillé Lise-MarieORCID, Talia MargheritaORCID, Urry C. MeganORCID, Valentino FrancescoORCID, Whitaker Katherine E.ORCID, Yung L. Y. AaronORCID, Zavala JorgeORCID,
Abstract
Abstract
We present a search for extremely red, dust-obscured, z > 7 galaxies with JWST/NIRCam+MIRI imaging over the first 20 arcmin2 of publicly available Cycle 1 data from the COSMOS-Web, CEERS, and PRIMER surveys. Based on their red color in F277W−F444W (∼2.5 mag) and detection in MIRI/F770W (∼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 ≲ 200 pc) and highly obscured (A
V
∼ 1.5–2.5) and, at our best-fit redshift estimates, likely have strong [O iii]+Hβ emission contributing to their 4.4 μm photometry. We estimate stellar masses of ∼1010
M
⊙ for both sources; by virtue of detection in MIRI at 7.7 μm, these measurements are robust to the inclusion of bright emission lines, for example, from an active galactic nucleus. We identify a marginal (2.9σ) 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 ∼1012
L
⊙. These two galaxies, if confirmed at z ∼ 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.
Funder
Space Telescope Science Institute National Science Foundation
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
2 articles.
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