The XMM-LSS survey: Optical assessment and properties of different X-ray selected cluster classes

C. Adami, A. Mazure, M. Pierre, P. G. Sprimont, C. Libbrecht, F. Pacaud, N. Clerc, T. Sadibekova, J. Surdej, B. Altieri, P. A. Duc, G. Galaz, A. Gueguen, L. Guennou, G. Hertling, O. Ilbert, J. P. Le Fèvre, H. Quintana, I. Valtchanov, J. P. WillisM. Akiyama, H. Aussel, L. Chiappetti, A. Detal, B. Garilli, V. Lebrun, O. Lefèvre, D. MacCagni, J. B. Melin, T. J. Ponman, D. Ricci, L. Tresse

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Context. XMM and Chandra opened a new area for the study of clusters of galaxies not only for cluster physics, but also for the detection of faint and distant clusters that were inaccessible with previous missions. Aims. This article presents 66 spectroscopically confirmed clusters (0.05≤ z≤1.5) within an area of 6 deg2 enclosed in the XMM-LSS survey. Almost two thirds have been confirmed with dedicated spectroscopy only and 10% have been confirmed with dedicated spectroscopy supplemented by literature redshifts. Methods.Sub-samples, or classes, of extended-sources are defined in a two-dimensional X-ray parameter space allowing for various degrees of completeness and contamination. We describe the procedure developed to assess the reality of these cluster candidates using the CFHTLS photometric data and spectroscopic information from our own follow-up campaigns. Results.Most of these objects are low-mass clusters, hence constituting a still poorly studied population. In a second step, we quantify the correlations between the optical properties such as richness or velocity dispersion and the cluster X-ray luminosities. We examine the relation of the clusters to the cosmic web. Finally, we review peculiar compact structures in the surveyed area such as very distant clusters and fossil groups.

Original languageEnglish
Article numberA18
JournalAstronomy and Astrophysics
Issue number2
Publication statusPublished - 2010 Dec 14


  • X-rays: galaxies: clusters
  • galaxies: clusters: general
  • large-scale structure of Universe
  • surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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