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 F. J.; Biviano, Andrea; Yee, Howard K. C.; Pintos-Castro, Irene; Webb, Kristi; Muzzin, Adam; Rudnick, Gregory; Vulcani, Benedetta; Poggianti, Bianca; Cooper, Michael; Zaritsky, Dennis; Cerulo, Pierluigi; Wilson, Gillian; et. al.

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 [O 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 (similar to 3.3 sigma) across the stellar mass range: 9.0 log (M-*/M-circle dot) 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.

Más información

Título según WOS: The GOGREEN survey: the environmental dependence of the star-forming galaxy main sequence at 1.0 < z < 1.5
Título de la Revista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volumen: 493
Número: 4
Editorial: Oxford Academic
Fecha de publicación: 2020
Página de inicio: 5987
Página final: 6000
DOI:

10.1093/mnras/staa579

Notas: ISI