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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addenda; surveys; large-scale structure of the Universe; X-rays: galaxies: clusters; errata
Abstract :
[en] We present X-ray and optical spectroscopic observations of twelve galaxy groups and clusters identified within the XMM Large-Scale Structure (LSS) survey. Groups and clusters are selected as extended X-ray sources from a 3.5 deg2 XMM image mosaic above a flux limit 8e-15 ergs/s/cm2 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Willis, J. P.
Pacaud, F.
Valtchanov, I.
Pierre, M.
Ponman, T.
Read, A.
Andreon, S.
Altieri, B.
Quintana, H.
Santos, S Dos
Birkinshaw, M.
Bremer, M.
Duc, P.-A.
Galaz, G.
Gosset, Eric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Jones, L.
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
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