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Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2004

The XMM-LSS Survey. First high redshift galaxy clusters: relaxed and collapsing systems

I. Valtchanov
  • Fonction : Auteur
M. Pierre
J. Willis
  • Fonction : Auteur
S. Dos Santos
  • Fonction : Auteur
L. Jones
  • Fonction : Auteur
S. Andreon
  • Fonction : Auteur
B. Altieri
M. Bolzonella
  • Fonction : Auteur
M. Bremer
  • Fonction : Auteur
E. Gosset
  • Fonction : Auteur
C. Jean
  • Fonction : Auteur

Résumé

We 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 \\times 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.

Dates et versions

hal-00008630 , version 1 (12-09-2005)

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Citer

I. Valtchanov, M. Pierre, J. Willis, S. Dos Santos, L. Jones, et al.. The XMM-LSS Survey. First high redshift galaxy clusters: relaxed and collapsing systems. Astronomy and Astrophysics - A&A, 2004, 423, pp.75-85. ⟨hal-00008630⟩
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