Oral Presentation

Star formation in cluster galaxies since z~1

Author(s): Howard Yee, Department of Astronomy and Astrophysics, University of Toronto

Presenter: Howard Yee (University of Toronto)

We will present an analysis of the quenching of star formation (SF)
in galaxy clusters since z~1, based on a sample of 209 galaxy
clusters from the SpARCS survey in the XMM-LSS and ELAIS-N1 fields,
combining data from the Subaru HSC-SSP (DR1), the Spitzer SWIRE survey, and UKISS. We examine the star-forming galaxy fraction as a function of redshift, galaxy stellar mass, and cluster-centric radius. We find that both environmental and mass quenching efficiencies are not separable within cluster environment, unlike in the field. We present the evolution of the SF "main sequence" (sSFR vs mass) in the field and in clusters over the same redshift range, using a combination of HSC-SSP and Spitzer MIPS data and preliminary spectroscopy from the GoGREEN survey, showing that high mass cluster galaxies have systematically lower sSFR in the clusters than in the field.