An Ancient Massive Quiescent Galaxy Found in a Gas-rich z ∼ 3 Group

Journal
Date Issued
2021
Author(s)
Kalita, Boris S.
•
Daddi, Emanuele
•
D'Eugenio, Chiara
•
Valentino, Francesco
•
Rich, R. Michael
•
Gómez-Guijarro, Carlos
•
Coogan, Rosemary T.
•
•
Elbaz, David
•
Neill, James D.
•
Puglisi, Annagrazia
•
DOI
Abstract
Deep Atacama Large Millimeter/submillimeter Array and Hubble Space Telescope observations reveal the presence of a quenched massive galaxy within the z = 2.91 galaxy group RO-1001. With a mass-weighted stellar age of 1.6 ± 0.4 Gyr this galaxy is one of the oldest known at z ~ 3, implying that most of its 1011 M⊙ of stars were rapidly formed at z > 6-8. This is a unique example of the predominantly passive evolution of a galaxy over at least 3 < z < 6 following its high-redshift quenching and a smoking-gun event pointing to the early imprint of an age-environment relation. At the same time, being in a dense group environment with extensive cold gas reservoirs as betrayed by a giant Lyα halo, the existence of this galaxy demonstrates that gas accretion shutdown is not necessary for quenching and its maintenance....
Volume
917
Issue
2
Start page
L17
Uri
Url
Issn Identifier
2041-8205
Rights
open.access
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