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Title:
The XMM Cluster Survey: The Dynamical State of XMMXCS J2215.9-1738 at z = 1.457
Authors:
Hilton, Matt; Collins, Chris A.; Stanford, S. Adam; Lidman, Chris; Dawson, Kyle S.; Davidson, Michael; Kay, Scott T.; Liddle, Andrew R.; Mann, Robert G.; Miller, Christopher J.; Nichol, Robert C.; Romer, A. Kathy; Sabirli, Kivanc; Viana, Pedro T. P.; West, Michael J.
Affiliation:
AA(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead, CH41 1LD, UK.; Current address: Astrophysics and Cosmology Research Unit, School of Mathematical Sciences, University of KwaZulu-Natal, Westville Campus, Private Bag X54001, Durban 4000, South Africa; .), AB(Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead, CH41 1LD, UK.), AC(University of California, Davis, CA 95616; .; Institute of Geophysics and Planetary Physics, Lawrence Livermore National Laboratory, Livermore, CA 94551.), AD(European Southern Observatory, Vitacura, Santiago 19, Chile.), AE(E. O. Lawrence Berkeley National Laboratory, Berkeley, CA 94720.), AF(Institute of Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, EH9 9HJ, UK.), AG(University of Manchester, Jodrell Bank Observatory, Macclesfield, Cheshire, SK11 9DL, UK.), AH(Astronomy Centre, University of Sussex, Falmer, Brighton, BN1 9QH, UK.), AI(Institute of Astronomy, University of Edinburgh, Blackford Hill, Edinburgh, EH9 9HJ, UK.), AJ(Cerro-Tololo Inter-American Observatory, National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719.), AK(Institute of Cosmology and Gravitation, University of Portsmouth, Portsmouth, PO1 2EG, UK.), AL(Astronomy Centre, University of Sussex, Falmer, Brighton, BN1 9QH, UK.), AM(Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15217.), AN(Departmento de Matemática Aplicada da Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, 4169-007, Portugal.; Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal.), AO(Gemini Observatory, Casilla 603, La Serena, Chile.)
Publication:
The Astrophysical Journal, Volume 670, Issue 2, pp. 1000-1009. (ApJ Homepage)
Publication Date:
12/2007
Origin:
UCP
ApJ Keywords:
galaxies: clusters: individual (XMMXCS J2215.9-1738), X-Rays: Galaxies: Clusters
DOI:
10.1086/522827
Bibliographic Code:
2007ApJ...670.1000H

Abstract

We present new spectroscopic observations of the most distant X-ray-selected galaxy cluster currently known, XMMXCS J2215.9-1738 at z=1.457, obtained with the DEIMOS instrument at the W. M. Keck Observatory and the FORS2 instrument on the ESO Very Large Telescope. Within the cluster virial radius, as estimated from the cluster X-ray properties, we increase the number of known spectroscopic cluster members to 17 objects, and calculate the line-of-sight velocity dispersion of the cluster to be 580+/-140 km s-1. We find mild evidence that the velocity distribution of galaxies within the virial radius deviates from a single Gaussian. We show that the properties of J2215.9-1738 are inconsistent with self-similar evolution of local X-ray scaling relations, finding that the cluster is underluminous given its X-ray temperature, and that the intracluster medium contains ~2-3 times the kinetic energy per unit mass of the cluster galaxies. These results can perhaps be explained if the cluster is observed in the aftermath of an off-axis merger. Alternatively, heating of the intracluster medium through supernovae and/or active galactic nucleus activity, as is required to explain the observed slope of the local X-ray luminosity-temperature relation, may be responsible.
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