Cluster Galaxy Population Evolution from the Subaru Hyper Suprime-Cam Survey: Brightest Cluster Galaxies, Stellar Mass Distribution, and Active Galaxies
Yen-Ting Lin1*, Bau-Ching Hsieh1, Sheng-Chieh Lin1, Masamune Oguri2, Kai-Feng Chen1, Masayuki Tanaka3, I-Non Chiu1, Song Huang4, Tadayuki Kodama5, Alexie Leauthaud4, Surhud More6, Atsushi Nishizawa7, Kevin Bundy4, Lihwai Lin1, Satoshi Miyazaki3
1Institute of Astronomy & Astrophysics, Academia Sinica, Taipei, Taiwan
2Department of Physics, The University of Tokyo, Tokyo, Japan
3National Astronomical Observatory of Japan, Tokyo, Japan
4Department of Astronomy and Astrophysics, University of California, Santa Cruz, Santa Cruz, CA, USA
5Institute of Astronomy, Tohoku University, Sendai, Japan
6Kavli Institute for the Physics and Mathematics of the Universe, The University of Tokyo, Chiba, Japan
7Institute for Advanced Research, Nagoya University, Nagoya, Japan
* Presenter:Yen-Ting Lin, email:ytl@asiaa.sinica.edu.tw
The unprecedented depth and area surveyed by the Subaru Strategic Program with the Hyper Suprime-Cam (HSC-SSP) have enabled us to construct and publish the largest distant cluster sample out to z~1 to date. In this exploratory study of cluster galaxy evolution from z=1 to z=0.3, we investigate the stellar mass assembly history of brightest cluster galaxies (BCGs), and evolution of stellar mass and luminosity distributions, stellar mass surface density profile, as well as the population of radio galaxies. Our analysis is the first high redshift application of the top N richest cluster selection, which is shown to allow us to trace the cluster galaxy evolution faithfully. Our stellar mass is derived from a machine-learning algorithm, which we show to be unbiased and accurate with respect to the COSMOS data. We find very mild stellar mass growth in BCGs, and no evidence for evolution in both the total stellar mass-cluster mass correlation and the shape of the stellar mass surface density profile. The clusters are found to contain more red galaxies compared to the expectations from the field, even after the differences in density between the two environments have been taken into account. We also present the first measurement of the radio luminosity distribution in clusters out to z~1.


Keywords: galaxies: clusters: general, galaxies: luminosity function, mass function, galaxies: elliptical and lenticular, cD, galaxies:active