Stellar Mass and 3.4 Micron M/L Ratio Evolution of Brightest Cluster Galaxies in COSMOS since z ~ 1.0

摘要: We investigate the evolution of star formation rates (SFRs), stellar masses, and M/L$_{3.4 \mu m}$ ratios brightest cluster galaxies (BCGs) in COSMOS survey since z ~ 1 to determine contribution growth-rate BCG mass over time. Through spectral energy distribution (SED) fitting GALEX, CFHT, Subaru, Vista, Spitzer, Herschel photometric data available COSMOS2015 catalog, we estimate SFR each BCG. use a modified version iSEDfit package fit SEDs our sample with both dust emission models, as well constrain impact history assumptions on results. find that BCGs, evolves similarly BCGs samples more massive galaxy clusters. However, compared latter, magnitude is lower by dex. Additionally, an baryonic mass-to-light ratio (M/L$_{3.4 m}$) redshift which consistent passively aging population. this build upon Wen et al.'s (2013) low-redshift $\nu$L$_{3.4 m}$-M$_{Stellar}$ relation, quantifying correlation between M$_{Stellar}$ 1. By comparing results Sunyaev-Zel'dovich X-ray-selected clusters, evidence normalization driven range may be biased upwards cool cores.