The XMM Cluster Survey: a massive galaxy cluster at z = 1.45

Stanford, S A, Romer, A Kathy, Sabirli, Kivanc, Davidson, Michael, Hilton, Matt, Viana, Pedro T P, Collins, Chris A, Kay, Scott T, Liddle, Andrew R, Mann, Robert G, Miller, Christopher J, Nichol, Robert C, West, Michael J, Conselice, Christopher J, Spinrad, Hyron, Stern, Daniel and Bundy, Kevin (2006) The XMM Cluster Survey: a massive galaxy cluster at z = 1.45. Astrophysical Journal, 646 (1). pp. 13-16. ISSN 0004-637X

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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 six galaxies within a ~60" diameter region lie at z=1.45+/-0.01. Model fits to the X-ray spectra of the extended emission yield kT=7.4+2.7-1.8 keV (90% confidence); if there is an undetected central X-ray point source, then kT=6.5+2.6-1.8 keV. The bolometric X-ray luminosity is LX=4.4+0.8-0.6C 1044 ergs s-1 over a 2 Mpc radial region. The measured TX, 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.

Item Type: Article
Additional Information: This paper presents the most distant X-ray cluster ever detected. As PI of the XCS, I have overall responsible for the pipeline X-ray processing that led to the discovery. I was also closely involved with the X-ray spectral analysis described in the paper.
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Depositing User: Kathy Romer
Date Deposited: 06 Feb 2012 19:30
Last Modified: 05 Aug 2019 13:00

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