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

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

2005-02-28

arxiv.org/abs/astro-ph/0503004v1

Astrophys.J.623:L85-L88,2005

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, accepted for publication in ApJ Letters, a high-resolution version is available at http://www.astro.lsa.

Scientific paper

10.1086/429801

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 1.381 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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