- Main
The GOGREEN survey: the environmental dependence of the star-forming galaxy main sequence at 1.0 < z < 1.5
- Old, Lyndsay J;
- Balogh, Michael L;
- van der Burg, Remco FJ;
- Biviano, Andrea;
- Yee, Howard KC;
- Pintos-Castro, Irene;
- Webb, Kristi;
- Muzzin, Adam;
- Rudnick, Gregory;
- Vulcani, Benedetta;
- Poggianti, Bianca;
- Cooper, Michael;
- Zaritsky, Dennis;
- Cerulo, Pierluigi;
- Wilson, Gillian;
- Chan, Jeffrey CC;
- Lidman, Chris;
- McGee, Sean;
- Demarco, Ricardo;
- Forrest, Ben;
- De Lucia, Gabriella;
- Gilbank, David;
- Kukstas, Egidijus;
- McCarthy, Ian G;
- Jablonka, Pascale;
- Nantais, Julie;
- Noble, Allison;
- Reeves, Andrew MM;
- Shipley, Heath
- et al.
Abstract
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 [$\rm{O{\small II}}$]-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.
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