The XMM Cluster Survey: evolution of the velocity dispersion–temperature relation over half a Hubble time

Wilson, Susan, Hilton, Matt, Rooney, Philip J, Caldwell, Caroline, Kay, Scott T, Collins, Chris A, McCarthy, Ian G, Romer, A Kathy, Bermeo, Alberto, Bernstein, Rebecca, da Costa, Luiz, Gifford, Daniel, Hollowood, Devon, Hoyle, Ben, Jeltema, Tesla, Liddle, Andrew R, Maia, Marcio A G, Mann, Robert G, Mayers, Julian A, Mehrtens, Nicola, Miller, Christopher J, Nichol, Robert C, Ogando, Ricardo, Sahlén, Martin, Stahl, Benjamin, Stott, John P, Thomas, Peter A, Viana, Pedro T P and Wilcox, Harry (2016) The XMM Cluster Survey: evolution of the velocity dispersion–temperature relation over half a Hubble time. Monthly Notices of the Royal Astronomical Society, 463 (1). pp. 413-428. ISSN 0035-8711

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We measure the evolution of the velocity dispersion–temperature (σv–TX) relation up to z = 1 using a sample of 38 galaxy clusters drawn from the XMM Cluster Survey. This work improves upon previous studies by the use of a homogeneous cluster sample and in terms of the number of high-redshift clusters included. We present here new redshift and velocity dispersion measurements for 12 z > 0.5 clusters observed with the Gemini Multi Object
Spectographs instruments on the Gemini telescopes. Using an orthogonal regression method,we find that the slope of the relation is steeper than that expected if clusters were self-similar, and that the evolution of the normalization is slightly negative, but not significantly different from zero (σv ∝T0.86±0.14E(z)−0.37±0.33). We verify our results by applying our methods to cosmological hydrodynamical simulations. The lack of evolution seen in our data is consistent with simulations that include both feedback and radiative cooling.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QB Astronomy
Depositing User: Peter Thomas
Date Deposited: 29 Sep 2016 09:47
Last Modified: 07 Mar 2017 08:33

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Project NameSussex Project NumberFunderFunder Ref
Astrophysics and Cosmology - Sussex Consolidated GrantG1291STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/L000652/1