The XMM Cluster Survey: A Massive Galaxy Cluster at z = 1.45

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We report the discovery of XMMXCS J2215.9-1738, a massive galaxy cluster at z = 1.45, which was found in the XMM Cluster Survey. The cluster candidate was initially identified as an extended X-ray source in archival XMM data. Optical spectroscopy shows that 6 galaxies within a {approx}60 arcsec diameter region lie at z = 1.45 {+-} 0.01. Model fits to the X-ray spectra of the extended emission yield kT = 7.4{sub -1.8}{sup +2.7} keV (90% confidence); if there is an undetected central X-ray point source then kT = 6.5{sub -1.8}{sup +2.6} keV. The bolometric X-ray luminosity is L{sub x} = ... continued below

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Stanford, S A; Romer, A K; Sabirli, K; Davidson, M; Hilton, M; Viana, P P et al. May 24, 2006.

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We report the discovery of XMMXCS J2215.9-1738, a massive galaxy cluster at z = 1.45, which was found in the XMM Cluster Survey. The cluster candidate was initially identified as an extended X-ray source in archival XMM data. Optical spectroscopy shows that 6 galaxies within a {approx}60 arcsec diameter region lie at z = 1.45 {+-} 0.01. Model fits to the X-ray spectra of the extended emission yield kT = 7.4{sub -1.8}{sup +2.7} keV (90% confidence); if there is an undetected central X-ray point source then kT = 6.5{sub -1.8}{sup +2.6} keV. The bolometric X-ray luminosity is L{sub x} = 4.4{sub -0.6}{sup +0.8} x 10{sup 44} ergs s{sup -1} over a 2 Mpc radial region. The measured T{sub x}, which is the highest for any known cluster at z > 1, suggests that this cluster is relatively massive for such a high redshift. The redshift of XMMXCS J2215.9-1738 is the highest currently known for a spectroscopically-confirmed cluster of galaxies.

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PDF-file: 18 pages; size: 0.4 Mbytes

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  • Journal Name: The Astrophysical Journal, vol. 646, no. 1, July 1, 2006, pp. 13-16; Journal Volume: 646; Journal Issue: 1

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  • Report No.: UCRL-JRNL-222031
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 900874
  • Archival Resource Key: ark:/67531/metadc878285

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  • May 24, 2006

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  • Sept. 22, 2016, 2:13 a.m.

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  • Dec. 2, 2016, 6:43 p.m.

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Stanford, S A; Romer, A K; Sabirli, K; Davidson, M; Hilton, M; Viana, P P et al. The XMM Cluster Survey: A Massive Galaxy Cluster at z = 1.45, article, May 24, 2006; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc878285/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.