Reference : The XMM-LSS survey: the Class 1 cluster sample over the initial 5 deg(2) and its cosmolo...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/25401
The XMM-LSS survey: the Class 1 cluster sample over the initial 5 deg(2) and its cosmological modelling
English
Pacaud, F. [> > > >]
Pierre, M. [> > > >]
Adami, C. [> > > >]
Altieri, B. [> > > >]
Andreon, S. [> > > >]
Chiappetti, L. [> > > >]
Detal, Alain mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO) >]
Duc, P. A. [> > > >]
Galaz, G. [> > > >]
Gueguen, A. [> > > >]
Le Fevre, J. P. [> > > >]
Hertling, G. [> > > >]
Libbrecht, C. [> > > >]
Melin, J. B. [> > > >]
Ponman, T. J. [> > > >]
Quintana, H. [> > > >]
Refregier, A. [> > > >]
Sprimont, Pierre-Guillaume mailto [Université de Liège - ULg > Département d'astrophys.]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Valtchanov, I. [> > > >]
Willis, J. P. [University of Victoria - UVic > Department of Physics and Astronomy >]
Alloin, D. [> > > >]
Birkinshaw, M. [> > > >]
Bremer, M. N. [> > > >]
Garcet, Olivier [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Jean, C. [> > > >]
Jones, L. R. [> > > >]
Le Fevre, O. [> > > >]
Maccagni, D. [> > > >]
Mazure, A. [> > > >]
Proust, D. [> > > >]
Rottgering, H. J. A. [> > > >]
Trinchieri, G. [> > > >]
11-Dec-2007
Monthly Notices of the Royal Astronomical Society
Blackwell Publishing
382
3
1289-1308
Yes (verified by ORBi)
International
0035-8711
Oxford
United Kingdom
[en] surveys ; cosmological parameters ; large-scale structure of Universe ; X-rays : galaxies : clusters
[en] We present a sample of 29 galaxy clusters from the XMM-LSS survey over an area of some 5 deg(2) out to a redshift of z = 1.05. The sample clusters, which represent about half of the X-ray clusters identified in the region, follow well-defined X-ray selection criteria and are all spectroscopically confirmed. For all clusters, we provide X-ray luminosities and temperatures as well as masses, obtained from dedicated spatial and spectral fitting. The cluster distribution peaks around z = 0.3 and T = 1.5 keV, half of the objects being groups with a temperature below 2 keV. Our L-X-T(z) relation points towards self-similar evolution, but does not exclude other physically plausible models. Assuming that cluster scaling laws follow self-similar evolution, our number density estimates up to z = 1 are compatible with the predictions of the concordance cosmology and with the findings of previous ROSAT surveys. Our well-monitored selection function allowed us to demonstrate that the inclusion of selection effects is essential for the correct determination of the evolution of the L-X-T relation, which may explain the contradictory results from previous studies. Extensive simulations show that extending the survey area to 10 deg(2) has the potential to exclude the non-evolution hypothesis, but those constraints on more refined intracluster medium models will probably be limited by the large intrinsic dispersion of the L-X-T relation, whatever be the sample size. We further demonstrate that increasing the dispersion in the scaling laws increases the number of detectable clusters, hence generating further degeneracy [in addition to sigma(8), Omega(m), L-X-T(z)] in the cosmological interpretation of the cluster number counts. We provide useful empirical formulae for the cluster mass-flux and mass-count rate relations as well as a comparison between the XMM-LSS mass sensitivity and that of forthcoming Sunyaev-Zel'dovich surveys.
ESA PRODEX Programme and Belgian Federal Science Policy Office
ESA PRODEX Programme "XMM-LSS"
Researchers ; Professionals
http://hdl.handle.net/2268/25401
10.1111/j.1365-2966.2007.12468.x
http://adsabs.harvard.edu/abs/2007MNRAS.382.1289P
The authors thank SAO/NASA ADS Astronomy Abstract Service for their deposit authorization and Blackwell Publishing for publication. The definitive version is available at www.blackwell-synergy.com

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