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

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

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mnras.363..675w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 363, Issue 2, pp. 675-691.

Astronomy and Astrophysics

Astronomy

49

Surveys, Large-Scale Structure Of Universe, X-Rays: Galaxies: Clusters

Scientific paper

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 deg2XMM image mosaic above a flux limit 8 × 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.

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