CEERS Key Paper V: A triality on the nature of HST-dark galaxies
CEERS Key Paper V: A triality on the nature of HST-dark galaxies
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, HST-dark galaxies among them. We gather JWST data from the CEERS survey in the EGS, jointly with HST data, and analyze spatially resolved optical-to-mid-IR spectral energy distributions (SEDs) to estimate both photometric redshifts in 2 dimensions and stellar populations properties in a pixel-by-pixel basis. We select 138 galaxies with F150W-F356W>1.5 mag, F356W<27.5 mag. The nature of these sources is threefold: (1) 71% are dusty star-forming galaxies at 2<z<6 with masses 9<log M/M_sun<11 and a variety of specific SFRs (<1 to >100 Gyr^-1); (2) 18% are quiescent/dormant (i.e., subject to reignition and rejuvenation) galaxies at 3<z<5, masses log M/M_sun~10 and post-starburst stellar mass-weighted ages (0.5-1 Gyr); and (3) 11% are strong young starbursts with indications of high-EW emission lines (typically, [OIII]+Hbeta) at 6<z<7 and log M/M_sun~9.5. The sample is dominated by disk-like galaxies with a 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 sub-millimeter 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 10^8 M_sun of their stellar content, 60% of them had assembled 10^9 M_sun, and 10% up to 10^10 M_sun (in situ or ex situ). (abridged)
Marianna Annunziatella、Rosemary T. Coogan、Guang Yang、Jonathan P. Gardner、Guillermo Barro、M. C. Cooper、Stijn Wuyts、Yuchen Guo、Lisa J. Kewley、Laura Bisigello、Asantha R. Cooray、Casey Papovich、Carlos G¨?mez-Guijarro、Maximilien Franco、Avishai Dekel、Caitlin M. Casey、Jorge A. Zavala、Weichen Wang、Mark Dickinson、Henry C. Ferguson、Ray A. Lucas、Jennifer M. Lotz、Rosa M. M¨|rida、Jeyhan S. Kartaltepe、Marc Huertas-Company、Elizabeth J. McGrath、Eric F. Bell、Micaela B. Bagley、Anton M. Koekemoer、Stephen M. Wilkins、Dale D. Kocevski、Rachel S. Somerville、Shardha Jogee、Arianna S. Long、¨￠ngela Garc¨aa-Argum¨￠nez、Swara Ravindranath、Nor Pirzkal、Bren E. Backhaus、V¨|ronique Buat、Peter Behroozi、Pablo G. P¨|rez-Gonz¨￠lez、Adriano Fontana、Nikko J. Cleri、Andrea Grazian、Jonathan R. Trump、Sandro Tacchella、David Elbaz、Steven L. Finkelstein、Allison Kirkpatrick、Pablo Arrabal Haro、Norman A. Grogin、Mauro Giavalisco、Luca Costantin、L. Y. Aaron Yung、Antonello Calabr¨°
天文学
Marianna Annunziatella,Rosemary T. Coogan,Guang Yang,Jonathan P. Gardner,Guillermo Barro,M. C. Cooper,Stijn Wuyts,Yuchen Guo,Lisa J. Kewley,Laura Bisigello,Asantha R. Cooray,Casey Papovich,Carlos G¨?mez-Guijarro,Maximilien Franco,Avishai Dekel,Caitlin M. Casey,Jorge A. Zavala,Weichen Wang,Mark Dickinson,Henry C. Ferguson,Ray A. Lucas,Jennifer M. Lotz,Rosa M. M¨|rida,Jeyhan S. Kartaltepe,Marc Huertas-Company,Elizabeth J. McGrath,Eric F. Bell,Micaela B. Bagley,Anton M. Koekemoer,Stephen M. Wilkins,Dale D. Kocevski,Rachel S. Somerville,Shardha Jogee,Arianna S. Long,¨￠ngela Garc¨aa-Argum¨￠nez,Swara Ravindranath,Nor Pirzkal,Bren E. Backhaus,V¨|ronique Buat,Peter Behroozi,Pablo G. P¨|rez-Gonz¨￠lez,Adriano Fontana,Nikko J. Cleri,Andrea Grazian,Jonathan R. Trump,Sandro Tacchella,David Elbaz,Steven L. Finkelstein,Allison Kirkpatrick,Pablo Arrabal Haro,Norman A. Grogin,Mauro Giavalisco,Luca Costantin,L. Y. Aaron Yung,Antonello Calabr¨°.CEERS Key Paper V: A triality on the nature of HST-dark galaxies[EB/OL].(2022-10-31)[2025-07-02].https://arxiv.org/abs/2211.00045.点此复制
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