The XMM cluster survey : evolution of the velocity dispersion-temperature relation over half a Hubble time

Wilson, Susan and Rooney, Philip J. and Caldwell, Caroline and Kay, Scott T. and Collins, Chris A. and McCarthy, Ian G. and Romer, A. Kathy and Bermeo, Alberto and Bernstein, Rebecca and da Costa, Luiz and Gifford, Daniel and Hollowood, Devon and Hoyle, Ben and Jeltema, Tesla and Liddle, Andrew R. and Maia, Marcio A. G. and Mann, Robert G. and Mayers, Julian A. and Mehrtens, Nicola and Miller, Christopher J. and Nichol, Robert C. and Ogando, Ricardo and Sahlen, Martin and Stahl, Benjamin and Stott, John P. and 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 (sigma(v)-T-X) 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 (sigma(v) alpha 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.

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Journal Article
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Monthly Notices of the Royal Astronomical Society
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This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record 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 A. Thomas, Pedro T. P. Viana, Harry Wilcox; The XMM Cluster Survey: evolution of the velocity dispersion–temperature relation over half a Hubble time. MNRAS 2016; 463 (1): 413-428. doi: 10.1093/mnras/stw1947 is available online at:
Uncontrolled Keywords:
?? galaxies: clusters: generalgalaxies: clusters: intracluster mediumgalaxies: distances and redshiftscosmology: miscellaneousx-rays: galaxies: clustersx-ray luminositytelescope dynamical massesactive galactic nucleinearby galaxy clustersweak-lensing massesd ??
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07 Feb 2017 14:26
Last Modified:
31 Dec 2023 00:46