The KMOS Cluster Survey (KCS). II. The Effect of Environment on the Structural Properties of Massive Cluster Galaxies at Redshift 1.39 < z < 1.61

摘要: We present results on the structural properties of massive passive galaxies in three clusters at 1.39. <. z. 1.61 from KMOS Cluster Survey. measure light-weighted and mass-weighted sizes optical nearinfrared Hubble Space Telescope imaging spatially resolved stellar mass maps. The rest-frame R-band these are a factor similar to 2-3 smaller than their local counterparts. slopes relation between size consistent with recent studies field. Their massweighted sizes, an average ratio that varies 0.45 0.8 among clusters. find median two more evolved is 24% larger for field galaxies, independent use circularized effective radii or semimajor axes. These also show less cluster, which we investigate using color gradients probe underlying M*/LH160 gradients. del(z) -H -0.4 mag dex(-1), twice value. Using populations models, best reproduced by combination age metallicity Our favor minor merger scenario as dominant process responsible observed galaxy environmental differences this redshift. support experience accelerated evolution compared field, likely via epoch enhanced activity during cluster assembly.