Volume 526, February 2011
|Number of page(s)||19|
|Section||Cosmology (including clusters of galaxies)|
|Published online||14 December 2010|
The XMM-LSS survey: optical assessment and properties of different X-ray selected cluster classes⋆
LAM, OAMP, Pôle de l’Etoile Site Château-Gombert 38, Rue Frédréric
Marseille Cedex 13,
2 Laboratoire AIM, CEA/DSM/IRFU/Sap, CEA-Saclay, 91191 Gif-sur-Yvette Cedex, France
3 Institut d’Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, B5C, 4000 Sart Tilman, Belgium
4 ESA, Villafranca del Castillo, Spain
5 UPMC Université Paris 06, UMR 7095, Institut d’Astrophysique de Paris, 75014 Paris, France
6 CNRS, UMR 7095, Institut d’Astrophysique de Paris, 75014 Paris, France
7 Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile
8 Argelander-Institut für Astronomie, University of Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
9 Department of Physics and Astronomy, University of Victoria, Elliot Building, 3800 Finnerty Road, Victoria, V8V 1A1, BC, Canada
10 INAF-IASF Milano, via Bassini 15, 20133 Milano, Italy
11 School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
12 Astronomical Institute, Tohoku University 6-3 Aramaki, Aoba-ku, Sendai 980-8578, Japan
13 CEA/DSM/IRFU/SPP, CEA Saclay, 91191 Gif-sur-Yvette, France
14 CEA/DSM/IRFU/SEDI, CEA Saclay, 91191 Gif-sur-Yvette, France
Accepted: 28 October 2010
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.
Key words: surveys / galaxies: clusters: general / large-scale structure of Universe / X-rays: galaxies: clusters
Based on observations obtained with MegaPrime/MegaCam, a joint project of CFHT and CEA/DAPNIA, at the Canada-France-Hawaii Telescope (CFHT), which is operated by the National Research Council (NRC) of Canada, the Institut National des Science de l’Univers of the Centre National de la Recherche Scientifique (CNRS) of France, and the University of Hawaii. This work is based in part on data products produced at TERAPIX and the Canadian Astronomy Data Centre as part of the Canada-France-Hawaii Telescope Legacy Survey, a collaborative project of NRC and CNRS. This work is also based on observations collected at TNG (La Palma, Spain), Magellan (Chile), and at ESO Telescopes at the La Silla and Paranal Observatories under programmes ID 072.A-0312, 074.A-0476, 076.A-0509, 070.A-0283, 072.A-0104, and 074.A-0360.
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.