Edinburgh Research Explorer

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

Research output: Contribution to journalArticle

  • 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
  • Marcio A. G. Maia
  • 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

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Open

Documents

http://mnras.oxfordjournals.org/content/463/1/413
Original languageEnglish
Pages (from-to)413-428
JournalMonthly Notices of the Royal Astronomical Society
Volume463
Issue number1
Early online date4 Aug 2016
DOIs
StatePublished - 21 Nov 2016

Abstract

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 GMOS 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 normalisation 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.

Research areas

  • galaxies: clusters: general, galaxies: clusters: intracluster medium, galaxies: distances and redshifts, X-rays: galaxies: clusters, cosmology: miscellaneous

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