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- Title
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.
- Authors
Hung-Yu JIAN; Lihwai LIN; Masamune OGURI; NISHIZAWA, Atsushi J.; Masahiro TAKADA; Surhud MORE; Yusei KOYAMA; Masayuki TANAKA; Yutaka KOMIYAMA
- Abstract
We utilize the Hyper Suprime-Cam (HSC) CAMIRA cluster catalog (Oguri et al. 2018 PASJ, 70, S20) and the photo-z galaxy catalog constructed in the HSC Wide field (S16A), covering ~174 deg2, to study the star formation activity of galaxies in different environments over 0.2 < z < 1.1. We probe galaxies down to i ~ 26, corresponding to a stellar mass limit of log10(M*/M⊙) ~ 8.2 and ~8.6 for star-forming and quiescent populations, respectively, at z ~ 0.2. The existence of the red sequence for low stellar mass galaxies in clusters suggests that the environmental quenching persists to halt the star formation in the low-mass regime. In addition, star-forming galaxies in groups or clusters are systematically biased toward lower values of specific star formation rate by 0.1-0.3 dex with respect to those in the field, and the offsets show no strong redshift evolution over our redshift range, implying a universal slow quenching mechanism acting in the dense environments since z ~ 1.1. Moreover, the environmental quenching dominates the mass quenching in low-mass galaxies, and the quenching dominance reverses in high-mass ones. The transition mass is greater in clusters than in groups, indicating that the environmental quenching is more effective for massive galaxies in clusters compared to groups.
- Subjects
GALAXY clusters; ASTRONOMICAL catalogs; STAR formation; GALAXIES; ASTRONOMICAL surveys; IMAGING systems in astronomy; GALACTIC redshift; GALAXY spectra
- Publication
Publications of the Astronomical Society of Japan, 2018, Vol 70, Issue Supp1, p1
- ISSN
0004-6264
- Publication type
Article
- DOI
10.1093/pasj/psx096