First Results on the Cluster Galaxy Population from the Subaru Hyper Suprime-Cam Survey. III. Brightest Cluster Galaxies, Stellar Mass Distribution, and Active Galaxies

Yen Ting Lin, Bau Ching Hsieh, Sheng Chieh Lin, Masamune Oguri, Kai Feng Chen, Masayuki Tanaka, I. Non Chiu, Song Huang, Tadayuki Kodama, Alexie Leauthaud, Surhud More, Atsushi J. Nishizawa, Kevin Bundy, Lihwai Lin, Satoshi Miyazaki

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The unprecedented depth and area surveyed by the Subaru Strategic Program with the Hyper Suprime-Cam (HSCSSP) 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), the evolution of stellar mass and luminosity distributions, the 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. Over the 230 deg2 area of the current HSC-SSP footprint, selecting the top 100 clusters in each of the four redshift bins allows us to observe the buildup of galaxy population in descendants of clusters whose z ≈ 1 mass is about 2 × 1014 M. Our stellar mass is derived from a machine-learning algorithm, which is found to be unbiased and accurate with respect to the COSMOS data. We find very mild stellar mass growth in BCGs (about 35% between z = 1 and 0.3), and no evidence for evolution in both the total stellar mass-cluster mass correlation and the shape of the stellar mass surface density profile. We also present the first measurement of the radio luminosity distribution in clusters out to z ∼ 1, and show hints of changes in the dominant accretion mode powering the cluster radio galaxies at z ∼ 0.8.

Original languageEnglish
Article number139
JournalAstrophysical Journal
Volume851
Issue number2
DOIs
Publication statusPublished - 2017 Dec 20

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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