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24 April 2024 |
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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
; | | Date: |
28 Feb 2005 | | Journal: | Astrophys.J. 623 (2005) L85-L88 | | Subject: | astro-ph | | 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 1.381 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. | | Source: | arXiv, astro-ph/0503004 | | Services: | Forum | Review | PDF | Favorites | |
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