The X-ray luminous galaxy cluster XMMU J1007.4+1237 at<i>z</i>= 1.56

Abstract

Context. Observational galaxy cluster studies at z > 1.5 probe the formation of the first massive M > 1014 M⊙ dark matter halos, the early thermal history of the hot ICM, and the emergence of the red-sequence population of quenched early-type galaxies.