The GOGREEN Survey: Evidence of an Excess of Quiescent Disks in Clusters at 1.0

Jeffrey C.C. Chan, Gillian Wilson, Michael Balogh, Gregory Rudnick, Remco F.J. Van Der Burg, Adam Muzzin, Kristi A. Webb, Andrea Biviano, Pierluigi Cerulo, M. C. Cooper, Gabriella De Lucia, Ricardo Demarco, Ben Forrest, Pascale Jablonka, Chris Lidman, Sean L. McGee, Julie Nantais, Lyndsay Old, Irene Pintos-Castro, Bianca PoggiantiAndrew M.M. Reeves, Benedetta Vulcani, Howard K.C. Yee, Dennis Zaritsky

Research output: Contribution to journalArticlepeer-review

Abstract

We present the results of the measured shapes of 832 galaxies in 11 galaxy clusters at 1.0 < z < 1.4 from the GOGREEN survey. We measure the axis ratio (q), the ratio of the minor to the major axis, of the cluster galaxies from near-infrared Hubble Space Telescope imaging using Sersic profile fitting and compare them with a field sample. We find that the median q of both star-forming and quiescent galaxies in clusters increases with stellar mass, similar to the field. Comparing the axis ratio distributions between clusters and the field in four mass bins, the distributions for star-forming galaxies in clusters are consistent with those in the field. Conversely, the distributions for quiescent galaxies in the two environments are distinct, most remarkably in where clusters show a flatter distribution, with an excess at low q. Modelling the distribution with oblate and triaxial components, we find that the cluster and field sample difference is consistent with an excess of flattened oblate quiescent galaxies in clusters. The oblate population contribution drops at high masses, resulting in a narrower q distribution in the massive population than at lower masses. Using a simple accretion model, we show that the observed q distributions and quenched fractions are consistent with a scenario where no morphological transformation occurs for the environmentally quenched population in the two intermediate-mass bins. Our results suggest that environmental quenching mechanism(s) likely produce a population that has a different morphological mix than those resulting from the dominant quenching mechanism in the field.

Original languageEnglish (US)
Article number32
JournalAstrophysical Journal
Volume920
Issue number1
DOIs
StatePublished - Oct 10 2021

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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