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29 March 2024
 
  » arxiv » astro-ph/0305192

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The XMM-LSS Survey. First high redshift galaxy clusters: relaxed and collapsing systems
I. Valtchanov ; M. Pierre ; J. Willis ; S. Dos Santos ; L. Jones ; S. Andreon ; C. Adami ; B. Altieri ; M. Bolzonella ; M. Bremer ; P.-A. Duc ; E. Gosset ; C. Jean ; J. Surdej ;
Date 12 May 2003
Journal Astron.Astrophys. 423 (2004) 75
Subject astro-ph
AbstractWe present five newly found galaxy clusters at z>0.6 from the XMM Large-Scale Structure Survey (XMM-LSS). All five objects are extended X-ray sources in the XMM images. For three of them we have sufficient spectroscopically confirmed member galaxies that an estimate of the velocity dispersion is possible: XLSSC 001 at z=0.613 and sigma_V=867^{+80}_{-60} km/s, XLSSC 002 at z=0.772 and sigma_V=524^{+267}_{-116} km/s and XLSSC 003 at z=0.839 and sigma_V=780^{+137}_{-75} km/s. These three clusters have X-ray bolometric luminosities L_X sim 1-3 imes 10^{44} erg/s and temperatures 2-4 keV, and consequently are less massive than previously known clusters at similar redshifts, but nevertheless they follow the low redshift scaling relations between L_X, T and sigma_V, within the limits of the measurement errors. One of the clusters, XLSSC 004, is detected independently as an overdensity of galaxies of a colour R-z’=1.4 that matches the redshift of the central galaxy z=0.87, although it cannot unambiguously be confirmed by the spectroscopic observations alone. The highest redshift candidate cluster pertaining to this paper, XLSSC 005, is most likely a double cluster complex at a redshift around unity, associated with an extended X-ray source with probable substructure.
Source arXiv, astro-ph/0305192
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