Discovery of an X-ray–luminous Galaxy Cluster at Z = 1.4


We report the discovery of a massive, X-ray-luminous cluster of galaxies at z=1.393, the most distant X-ray–selected cluster found to date. XMMU J2235.3–2557 was serendipitously detected as an extended X-ray source in an archival XMM-Newton observation of NGC 7314. VLT-FORS2 R and z band snapshot imaging reveals an over-density of red galaxies in both… (More)


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