First results on the cluster galaxy population from the Subaru Hyper Suprime-Cam survey. II. Faint end color–magnitude diagrams and radial profiles of red and blue galaxies at 0.1 < z < 1.1

PASJ: Publications of the Astronomical Society of Japan

Mandelbaum, Rachel¹  Leauthaud, Alexie²  Komiyama, Yutaka³  Coupon, Jean⁴  Oogi, Taira⁵  Takada, Masahiro⁶  Nishizawa, Atsushi J⁷  Bahcall, Neta⁸  Jian, Hung-Yu⁹  Nagashima, Masahiro⁹  Nishimichi, Takahiro⁹  Lin, Lihwai⁹  Tanaka, Masayuki⁹  Lin, Yen-Ting⁹  More, Surhud⁹  Huang, Song^1,10  Miyatake, Hironao^1,11  Oguri, Masamune^1,12  Miyazaki, Satoshi^1,13 

[1] CREST, JST, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan;Department of Astronomy, University of Geneva, ch. d’É 16, 1290 Versoix, Switzerland;Department of Astrophysical Sciences, Princeton University, 4 Ivy Ln, Princeton, NJ 08544, USA;Department of Physics, National Taiwan University, 10617 Taipei, Taiwan;Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;Faculty of Education, Bunkyo University, 3337 Minami-Ogishima, Koshigaya-shi, Saitama 343-8511, Japan;Institute for Advanced Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan;Institute of Astronomy and Astrophysics, Academia Sinica, P.O. Box 23-141, Taipei 10617, Taiwan;Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan;McWilliams Center for Cosmology, Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA;National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan;Research Center for the Early Universe, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan;SOKENDAI(The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

关键词: galaxies: clusters: general;    galaxies: evolution;    (cosmology:) dark matter;   

DOI  :  10.1093/pasj/psx106

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

We present a statistical study of the redshift evolution of the cluster galaxy population over a wide redshift range from 0.1 to 1.1, using ∼1900 optically-selected CAMIRA clusters from ∼232 deg2 of the Hyper Suprime-Cam (HSC) Wide S16A data. Our stacking technique with a statistical background subtraction reveals color–magnitude diagrams of red-sequence and blue cluster galaxies down to faint magnitudes of mz ∼ 24. We find that the linear relation of red-sequence galaxies in the color–magnitude diagram extends down to the faintest magnitudes we explore with a small intrinsic scatter σint(g − r) < 0.1. The scatter does not evolve significantly with redshift. The stacked color–magnitude diagrams are used to define red and blue galaxies in clusters in order to study their radial number density profiles without resorting to photometric redshifts of individual galaxies. We find that red galaxies are significantly more concentrated toward cluster centers and blue galaxies dominate the outskirts of clusters. We explore the fraction of red galaxies in clusters as a function of redshift, and find that the red fraction decreases with increasing distances from cluster centers. The red fraction exhibits a moderate decrease with increasing redshift. The radial number density profiles of cluster member galaxies are also used to infer the location of the steepest slope in the three-dimensional galaxy density profiles. For a fixed threshold in richness, we find little redshift evolution in this location.

【 授权许可】

CC BY