The GOGREEN survey: Transition galaxies and the evolution of environmental quenching

Karen McNab, Michael L. Balogh, Remco F.J. van der Burg, Anya Forestell, Kristi Webb, Benedetta Vulcani, Gregory Rudnick, Adam Muzzin, M. C. Cooper, Sean McGee, Andrea Biviano, Pierluigi Cerulo, Jeffrey C.C. Chan, Gabriella de Lucia, Ricardo Demarco, Alexis Finoguenov, Ben Forrest, Caelan Golledge, Pascale Jablonka, Chris LidmanJulie Nantais, Lyndsay Old, Irene Pintos-Castro, Bianca Poggianti, Andrew M.M. Reeves, Gillian Wilson, Howard K.C. Yee, Dennis Zaritsky

Research output: Contribution to journalArticlepeer-review

Abstract

We measure the rate of environmentally driven star formation quenching in galaxies at z ∼ 1, using eleven massive (M ≈ 2 × 1014 M) galaxy clusters spanning a redshift range 1.0 < z < 1.4 from the GOGREEN sample. We identify three different types of transition galaxies: ‘green valley’ (GV) galaxies identified from their rest-frame (NUV - V) and (V - J) colours; ‘blue quiescent’ (BQ) galaxies, found at the blue end of the quiescent sequence in (U - V) and (V - J) colour; and spectroscopic post-starburst (PSB) galaxies. We measure the abundance of these galaxies as a function of stellar mass and environment. For high-stellar mass galaxies (log M/M > 10.5) we do not find any significant excess of transition galaxies in clusters, relative to a comparison field sample at the same redshift. It is likely that such galaxies were quenched prior to their accretion in the cluster, in group, filament, or protocluster environments. For lower stellar mass galaxies (9.5 < log M/M < 10.5) there is a small but significant excess of transition galaxies in clusters, accounting for an additional ∼5–10 per cent of the population compared with the field. We show that our data are consistent with a scenario in which 20–30 per cent of low-mass, star-forming galaxies in clusters are environmentally quenched every Gyr, and that this rate slowly declines from z = 1 to z = 0. While environmental quenching of these galaxies may include a long delay time during which star formation declines slowly, in most cases this must end with a rapid (τ < 1 Gyr) decline in star formation rate.

Original languageEnglish (US)
Pages (from-to)157-174
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume508
Issue number1
DOIs
StatePublished - Nov 1 2021

Keywords

  • Galaxies: clusters: general
  • Galaxies: evolution
  • Galaxies: star formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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