The XMM Large-Scale Structure survey: an initial sample of galaxy groups and clusters to a redshift z<0.6

JP Willis, F Pacaud, I Valtchanov, M Pierre, Trevor Ponman, A Read, S Andreon, B Altieri, H Quintana, S Dos Santos, M Birkinshaw, M Bremer, PA Duc, G Galaz, E Gosset, Laurence Jones, J Surdej

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We present X-ray and optical spectroscopic observations of 12 galaxy groups and clusters identified within the X-ray Multi-Mirror (XMM) Large-Scale Structure (LSS) survey. Groups and clusters are selected as extended X-ray sources from a 3.5 deg(2) XMM image mosaic above a flux limit 8 x 10(-15) erg s(-1) cm(-2) in the [0.5-2] keV energy band. Deep BVRI images and multi-object spectroscopy confirm each source as a galaxy concentration located within the redshift interval 0.29 <z <0.56. We combine line-of-sight velocity dispersions with the X-ray properties of each structure computed from a two-dimensional surface brightness model and a single temperature fit to the XMM spectral data. The resulting distribution of X-ray luminosity, temperature and velocity dispersion indicate that the XMM-LSS survey is detecting low-mass clusters and galaxy groups to redshifts z <0.6. Confirmed systems display little or no evidence for X-ray luminosity evolution at a given X-ray temperature compared to lower-redshift X-ray group and cluster samples. A more complete understanding of these trends will be possible with the compilation of a statistically complete sample of galaxy groups and clusters anticipated within the continuing XMM-LSS survey.
Original languageEnglish
Pages (from-to)675-691
Number of pages17
JournalRoyal Astronomical Society. Monthly Notices
Issue number2
Early online date7 Sept 2005
Publication statusPublished - 7 Sept 2005


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