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

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journal contribution
posted on 2023-06-09, 03:11 authored by Susan Wilson, Matt Hilton, Philip J Rooney, Caroline Caldwell, Scott T Kay, Chris A Collins, Ian G McCarthy, A Kathy Romer, Alberto Bermeo, Rebecca Bernstein, Luiz da Costa, Daniel Gifford, Devon Hollowood, Ben Hoyle, Tesla Jeltema, Andrew R Liddle, Marcio A G Maia, Robert G Mann, Julian A Mayers, Nicola Mehrtens, Christopher J Miller, Robert C Nichol, Ricardo Ogando, Martin Sahlén, Benjamin Stahl, John P Stott, Peter ThomasPeter Thomas, Pedro T P Viana, Harry Wilcox
We measure the evolution of the velocity dispersion–temperature (sv–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 (sv ?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.

Funding

Astrophysics and Cosmology - Sussex Consolidated Grant; G1291; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/L000652/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

1

Volume

463

Page range

413-428

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2016-09-29

First Open Access (FOA) Date

2016-09-29

First Compliant Deposit (FCD) Date

2016-09-29

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