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

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

Feb 26, 2020

14 pages

Published in:

Mon.Not.Roy.Astron.Soc. 493 (2020) 4, 5987-6000

Published: Apr 21, 2020

e-Print:

2002.11735 [astro-ph.GA]

DOI:

10.1093/mnras/staa579 (publication)

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Abstract: (Oxford University Press)

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.

Note:

Accepted for publication in MNRAS on February 25 2020, appended erratum accepted in MNRAS on September 17 2020

galaxies: clusters: general
galaxies: evolution

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