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 \sim 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 ) , 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 .
Over the 230 deg ^ { 2 } area of the current HSC-SSP footprint , selecting the top 100 clusters in each of the 4 redshift bins allows us to observe the buildup of galaxy population in descendants of clusters whose z \approx 1 mass is about 2 \times 10 ^ { 14 } M _ { \odot } .
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 \sim 1 , and show hints of changes in the dominant accretion mode powering the cluster radio galaxies at z \sim 0.8 .