SPT-CL J0205-5829: A z = 1.32 Evolved Massive Galaxy Cluster in the South Pole Telescope Sunyaev-Zel_s14dovich Effect Survey
Keywords
early universe, galaxies: clusters: individual: SPT-CL J0205dash5829, galaxies: evolution, galaxies: formation, large-scale structure of universe
Abstract
The galaxy cluster SPT-CL J0205-5829 currently has the highest spectroscopically confirmed redshift, z = 1.322, in the South Pole Telescope Sunyaev-Zel_s14dovich (SPT-SZ) survey. XMM-Newton observations measure a core-excluded temperature of TX = 8.7_s161.0 -0.8 keV producing a mass estimate that is consistent with the Sunyaev-Zel_s14dovich-derived mass. The combined SZ and X-ray mass estimate of M 500 = (4.8 ± 0.8) × 1014 h -1 70 M _s13_s178857_s19 makes it the most massive known SZ-selected galaxy cluster at z > 1.2 and the second most massive at z > 1. Using optical and infrared observations, we find that the brightest galaxies in SPT-CL J0205-5829 are already well evolved by the time the universe was
