Volume 423, Number 1, August III 2004
|Page(s)||75 - 85|
|Section||Cosmology (including clusters of galaxies)|
|Published online||29 July 2004|
The XMM-LSS survey*
First high redshift galaxy clusters: Relaxed and collapsing systems
CEA/Saclay, Service d'Astrophysique, 91191, Gif-sur-Yvette, France e-mail: email@example.com
2 Astrophysics Group, Blackett Laboratory, Imperial College, London SW7 2BW, UK
3 ESO, Ave. Alonso de Cordova 3107, Casilla 19, Santiago 19001, Chile
4 School of Physics and Astronomy, University of Birmingham, Birmingham, UK
5 INAF – Osservatorio Astronomico di Brera, via Brera 28, 20121 Milano, Italy
6 LAM, Traverse du Siphon, 13012 Marseille, France
7 ESA, Villafranca del Castillo, Spain
8 Istituto di Astrofisica Spaziale e Fisica Cosmica, Sezione di Milano, via Bassini 15, 20133 Milano
9 Department of Physics, University of Bristol, H.H. Wills Laboratory, Bristol, UK
10 Université de Liège, Allée du 6 Août, 17, B5C, 4000 Sart Tilman, Belgium
Accepted: 5 May 2004
We present five newly found galaxy clusters at 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 and km s-1, XLSSC 002 at and km s-1 and XLSSC 003 at and km s-1. These three clusters have X-ray bolometric luminosities erg s-1 and temperatures keV, and consequently are less massive than previously known clusters at similar redshifts, but nevertheless they follow the low redshift scaling relations between and , within the limits of the measurement errors. One of the clusters, XLSSC 004, is detected independently as an overdensity of galaxies of a colour that matches the redshift of the central galaxy , 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.
Key words: X-rays: galaxies: clusters / cosmology: large-scale structure of Universe / surveys
© ESO, 2004
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