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We utilize the HSC CAMIRA cluster catalog and the photo-$z$ galaxy catalogconstructed in the HSC wide field (S16A), covering $\sim$ 174 deg$^{2}$, tostudy the star formation activity of galaxies in different environments over0.2 $<$ $z$ $<$ 1.1. We probe galaxies down to $i \sim$ 26, corresponding to astellar mass limit of log$_{10}$(M$_*$/M$_{\odot}$) $\sim$ 8.2 and $\sim$ 8.6for star-forming and quiescent populations, respectively, at $z$ $\sim$ 0.2.The existence of the red sequence for low stellar mass galaxies in clusterssuggests that the environmental quenching persists to halt the star formationin the low-mass regime. In addition, star-forming galaxies in groups orclusters are systematically biased toward lower values of specific starformation rate by 0.1 -- 0.3 dex with respect to those in the field and theoffsets shows no strong redshift evolution over our redshift range, implying auniversal slow quenching mechanism acting in the dense environments since $z$$\sim$ 1.1. Moreover, the environmental quenching dominates the mass quenchingin low mass galaxies, and the quenching dominance reverses in high mass ones.The transition mass is greater in clusters than in groups, indicating that theenvironmental quenching is more effective for massive galaxies in clusterscompared to groups.

publications of the astronomical society of japan

First results on the cluster galaxy population from the Subaru Hyper  Suprime-Cam survey. I. The role of group or cluster environment in star  formation quenching from z = 0.2 to 1.1