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

Stanford, SA, Romer, A.K., Sabirli, K., Davidson, M., Hilton, M., Viana, P.T.P., Collins, C.A., Kay, S.T., Liddle, A.R. and Mann, R.G. (2006) The XMM Cluster Survey: A Massive Galaxy Cluster at z= 1.45. Astrophysical Journal, 646 (2). L13-L16. ISSN 0004-637X

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Abstract

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 ∼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+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 −0.6 × 1044 ergs s−1 over a 2 Mpc radial region. The measured Tx, which is the highest known for a 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
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Depositing User: SRO Admin
Date Deposited: 20 Mar 2007
Last Modified: 19 Jul 2017 18:52
URI: http://sro.sussex.ac.uk/id/eprint/1092
Google Scholar:114 Citations

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