The GOGREEN survey: the environmental dependence of the star-forming galaxy main sequence at 1.0 < z < 1.5

Journal
Date Issued
2020
Author(s)
Old, Lyndsay J.
•
Balogh, Michael L.
•
van der Burg, Remco F. J.
•
•
Yee, Howard K. C.
•
Pintos-Castro, Irene
•
Webb, Kristi
•
Muzzin, Adam
•
Rudnick, Gregory
•
•
•
Cooper, Michael
•
Zaritsky, Dennis
•
Cerulo, Pierluigi
•
Wilson, Gillian
•
Chan, Jeffrey C. C.
•
Lidman, Chris
•
McGee, Sean
•
Demarco, Ricardo
•
Forrest, Ben
•
•
Gilbank, David
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Kukstas, Egidijus
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McCarthy, Ian G.
•
Jablonka, Pascale
•
Nantais, Julie
•
Noble, Allison
•
Reeves, Andrew M. M.
•
Shipley, Heath
DOI
Abstract
We present results on the environmental dependence of the star-forming galaxy main sequence in 11 galaxy cluster fields at 1.0 < z < 1.5 from the Gemini Observations of Galaxies in Rich Early Environments Survey (GOGREEN) survey. We use a homogeneously selected sample of field and cluster galaxies whose membership is derived from dynamical analysis. Using [OII]-derived star formation rates (SFRs), we find that cluster galaxies have suppressed SFRs at fixed stellar mass in comparison to their field counterparts by a factor of 1.4 ± 0.1 (∼3.3σ) across the stellar mass range: 9.0 < log (M*/M⊙) < 11.2. We also find that this modest suppression in the cluster galaxy star-forming main sequence is mass and redshift dependent: the difference between cluster and field increases towards lower stellar masses and lower redshift. When comparing the distribution of cluster and field galaxy SFRs to the star-forming main sequence, we find an overall shift towards lower SFRs in the cluster population, and note the absence of a tail of high SFR galaxies as seen in the field. Given this observed suppression in the cluster galaxy star-forming main sequence, we explore the implications for several scenarios such as formation time differences between cluster and field galaxies, and environmentally induced star formation quenching and associated time-scales.
Volume
493
Issue
4
Start page
5987
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2020MNRAS.493.5987O
Rights
open.access
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