Star Formation in Cluster Galaxies since z~1

Wednesday, October 24, 2018 11:30 am - 11:30 am EDT (GMT -04:00)

Astronomy Lunch Series

Photo of Howard Yee
Howard Yee

Department of Astronomy & Astrophysics
University of Toronto

I 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, using publicly released photometric data from the Subaru HSC-SSP, the Spitzer SWIRE survey, and UKISS. In particular, we examine the star-forming galaxy fraction (f_SF) as a function of redshift, galaxy stellar mass, and cluster-centric radius and investigate the evolution of both environmental and mass quenching efficiencies. I will also discuss some preliminary results on the SFR-stellar mass relation (the "main sequence") in the field and in clusters, using a combination of HSC-SSP and Spitzer SWIRE MIPS data, over the same redshift range. Finally, I will present a first-look at the data from a new project which investigates the relationship between cluster environment and star formation in z~0.25 rich clusters using the new, wide-field, imaging Fourier transform spectrometer, SITELLE, at CFHT, obtaining 2D spectroscopic data in H-alpha/[NII] of cluster galaxies out to ~2R_200.