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Discovery of an X-ray-Luminous Galaxy Cluster at z=1.4

C. R. Mullis·P. Rosati·G. Lamer·H. Boehringer·A. Schwope·P. Schuecker·R. Fassbender
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Abstract

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 angular and color spaces. The galaxy enhancement is coincident in the sky with the X-ray emission; the cluster red sequence at R-z ~ 2.1 identifies it as a high-redshift candidate. Subsequent VLT-FORS2 multi-object spectroscopy unambiguously confirms the presence of a massive cluster based on 12 concordant redshifts in the interval 1.38 1 cluster found with XMM-Newton, the relative ease and efficiency of discovery demonstrates that it should be possible to build large samples of z>1 clusters through the joint use of X-ray and large, ground-based telescopes.

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C. R. Mullis, P. Rosati, G. Lamer, H. Boehringer, A. Schwope, P. Schuecker, R. Fassbender. 2005-02-28. Discovery of an X-ray-Luminous Galaxy Cluster at z=1.4. https://doi.org/10.1086/429801

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