CEERS Key Paper. IV. A Triality in the Nature of HST-dark Galaxies

Pérez-González, Pablo G.; Barro, Guillermo; Annunziatella, Marianna; Costantin, Luca; García-Argumánez, Ángela; McGrath, Elizabeth J.; Mérida, Rosa M.; Zavala, Jorge A.; Arrabal Haro, Pablo; Bagley, Micaela B.; Backhaus, Bren E.; Behroozi, Peter; Bell, Eric F.; Bisigello, Laura; Buat, Véronique; Calabrò, Antonello; Casey, Caitlin M.; Cleri, Nikko J.; Coogan, Rosemary T.; Cooper, M. C.; Cooray, Asantha R.; Dekel, Avishai; Dickinson, Mark; Elbaz, David; Ferguson, Henry C.; Finkelstein, Steven L.; Fontana, Adriano; Franco, Maximilien; Gardner, Jonathan P.; Giavalisco, Mauro; Gómez-Guijarro, Carlos; Grazian, Andrea; Grogin, Norman A.; Guo, Yuchen; Huertas-Company, Marc; Jogee, Shardha; Kartaltepe, Jeyhan S.; Kewley, Lisa J.; Kirkpatrick, Allison; Kocevski, Dale D.; Koekemoer, Anton M.; Long, Arianna S.; Lotz, Jennifer M.; Lucas, Ray A.; Papovich, Casey; Pirzkal, Nor; Ravindranath, Swara; Somerville, Rachel S.; Tacchella, Sandro; Trump, Jonathan R.; Wang, Weichen; Wilkins, Stephen M.; Wuyts, Stijn; Yang, Guang; Aaron Yung, L. Y.
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The Astrophysical Journal

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The new capabilities that JWST offers in the near- and mid-infrared (IR) are used to investigate in unprecedented detail the nature of optical/near-IR-faint, mid-IR-bright sources, with HST-dark galaxies among them. We gather JWST data from the CEERS survey in the Extended Groth Strip, jointly with HST data, and analyze spatially resolved optical-to-mid-IR spectral energy distributions to estimate photometric redshifts in two dimensions and stellar population properties on a pixel-by-pixel basis for red galaxies detected by NIRCam. We select 138 galaxies with F150W - F356W > 1.5 mag and F356W < 27.5 mag. The nature of these sources is threefold: (1) 71% are dusty star-forming galaxies (SFGs) at 2 < z < 6 with $9\lt \mathrm{log}{M}_{\star }/{M}_{\odot }\lt 11$ and a variety of specific SFRs (<1 to >100 Gyr-1); (2) 18% are quiescent/dormant (i.e., subject to reignition/rejuvenation) galaxies (QGs) at 3 < z < 5, with $\mathrm{log}{M}_{\star }/{M}_{\odot }\sim 10$ and poststarburst mass-weighted ages (0.5-1.0 Gyr); and (3) 11% are strong young starbursts with indications of high equivalent width emission lines (typically, [O III]+Hβ) at 6 < z < 7 (XELG-z6) and $\mathrm{log}{M}_{\star }/{M}_{\odot }\sim 9.5$ . The sample is dominated by disk-like galaxies with remarkable compactness for XELG-z6 (effective radii smaller than 0.4 kpc). Large attenuations in SFGs, 2 < A(V) < 5 mag, are found within 1.5 times the effective radius, approximately 2 kpc, while QGs present A(V) ~ 0.2 mag. Our SED-fitting technique reproduces the expected dust emission luminosities of IR-bright and submillimeter galaxies. This study implies high levels of star formation activity between z ~ 20 and z ~ 10, where virtually 100% of our galaxies had already formed 108 M ⊙, 60% had assembled 109 M ⊙, and 10% up to 1010 M ⊙ (in situ or ex situ).
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