Reference : The XMM large-scale structure survey: an initial sample of galaxy groups and clusters...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
The XMM large-scale structure survey: an initial sample of galaxy groups and clusters to a redshift z < 0.6
Willis, J. P. [University of Victoria - UVic > Department of Physics and Astronomy >]
Pacaud, F. [> > > >]
Valtchanov, I. [> > > >]
Pierre, M. [> > > >]
Ponman, T. [> > > >]
Read, A. [> > > >]
Andreon, S. [> > > >]
Altieri, B. [> > > >]
Quintana, H. [> > > >]
Dos Santos, S. [> > > >]
Birkinshaw, M. [> > > >]
Bremer, M. [> > > >]
Duc, P. A. [> > > >]
Galaz, G. [> > > >]
Gosset, Eric mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Jones, L. [> > > >]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
Yes (verified by ORBi)
[en] surveys ; large-scale structure of Universe ; X-rays : galaxies : clusters
[en] 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.
ESA PRODEX Programme and Belgian Federal Science Policy Office
Researchers ; Professionals
The authors thank SAO/NASA ADS Astronomy Abstract Service for their deposit authorization and Blackwell Publishing for publication

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