[en] The XMM Large Scale Structure survey (XMM-LSS) is a medium deep large area X-ray survey. Its goal is to extend large scale structure investigations attempted using ROSAT cluster samples to two redshift bins between 0<z<1 while maintaining the precision of earlier studies. Two main goals have constrained the survey design: the evolutionary study of the cluster cluster correlation function and of the cluster number density. The adopted observing configuration consists of an equatorial mosaic of 10 ks pointings, separated by 20^\prime and covering 8° à 8°, giving a pointsource sensitivity of {\sim } 5\times 10^{-15}~{\mathrm {erg~cm^{-2}~s^{-1}}} in the 0.5 2 keV band. This will yield more than 800 clusters of galaxies and a sample of X-ray AGN with a space density of about 300 deg[SUP]-2[/SUP]. We present the expected cosmological implications of the survey in the context of LgrCDM models and cluster evolution. We give an overview of the first observational results. The XMM-LSS survey is associated with several other major surveys, ranging from the UV to the radio wavebands, which will provide the necessary resources for X-ray source identification and further statistical studies. In particular, the associated CFHTLS weak lensing and AMiBA Sunyaev Zel'dovich surveys over the entire XMM-LSS area will provide for the first time a comprehensive study of the mass distribution and of cluster physics in the universe on scales of a few hundred Mpc. We describe the main characteristics of our wavelet-based X-ray pipeline and source identification procedures, including the classification of the cluster candidates by means of a photometric redshift analysis. This permits the selection of suitable targets for spectroscopic follow-up. We present preliminary results from the first 25 XMM-LSS pointings: X-ray source properties, optical counterparts, and highlights from the first Magellan and VLT/FORS2 spectroscopic runs as well as preliminary results from the NIR search for z>1 clusters. The results are promising and, so far, in accordance with our predictions. In particular: (1) we reproduce the logN logS distribution for point sources obtained from deeper surveys at our sensitivity; (2) we find a cluster number density of 15 20 deg[SUP]-2[/SUP] (3) for the first time, we statistically sample the group mass regime at a redshift out to {\sim } 0.5 . Paper based on observations obtained with the XMM,CFH, ESO (Prg: P70. A-0283 .A-0733), VLA, CTIO and Las Campanas observatories.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Pierre, Marguerite; CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, F-91191 Gif sur Yvette, France
Valtchanov, Ivan; CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, F-91191 Gif sur Yvette, France
Altieri, Bruno; XMM Science Operations Centre, Villafranca, Spain
Andreon, Stefano; Osservatorio Astronomico di Brera, Milano, Italy
Bolzonella, Micol; IASF, Milano, Italy
Bremer, Malcolm; Department of Physics, University of Bristol, UK
Disseau, Ludovic; Ecole Normal Supérieure, Paris, France ; European Southern Observatory, Santiago, Chile
Dos Santos, Sergio; CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, F-91191 Gif sur Yvette, France
Gandhi, Poshak; European Southern Observatory, Santiago, Chile
Jean, Christophe; Institut d'Astrophysique et de Géophysique, Université de Liège, Belgium
Pacaud, Florian; CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, F-91191 Gif sur Yvette, France
Read, Andrew; School of Physics and Astronomy, University of Birmingham, UK
Refregier, Alexandre; CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, F-91191 Gif sur Yvette, France
Willis, Jon; European Southern Observatory, Santiago, Chile ; Pontificia Universidad Católica, Santiago, Chile
Adami, Christophe; Laboratoire d'Astrophysique, Marseille, France
Alloin, Danielle; European Southern Observatory, Santiago, Chile
Birkinshaw, Mark; Department of Physics, University of Bristol, UK
Chiappetti, Lucio; IASF, Milano, Italy
Cohen, Aaron; Naval Research Laboratory, Washington, USA
Detal, Alain ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Duc, Pierre-Alain; CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, F-91191 Gif sur Yvette, France
Gosset, Eric ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Jones, Laurence; School of Physics and Astronomy, University of Birmingham, UK
LeFevre, Olivier; Laboratoire d'Astrophysique, Marseille, France
Lonsdale, Carol; Infrared Processing and Analysis Center, Caltech, USA
Maccagni, Dario; IASF, Milano, Italy
Mazure, Alain; Laboratoire d'Astrophysique, Marseille, France
McBreen, Brian; Physics Department, University College, Dublin, Republic of Ireland
McCracken, Henry; Laboratoire d'Astrophysique, Marseille, France
Mellier, Yannick; Institut d'Astrophysique, Paris, France
Ponman, Trevor; School of Physics and Astronomy, University of Birmingham, UK
Quintana, Hernan; Pontificia Universidad Católica, Santiago, Chile
Rottgering, Huub; Leiden Observatory, Leiden, The Netherlands
Smette, Alain; Institut d'Astrophysique et de Géophysique, Université de Liège, Belgium
Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Starck, Jean-Luc; CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, F-91191 Gif sur Yvette, France
Vigroux, Laurent; CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, F-91191 Gif sur Yvette, France
White, Simon; Max Planck Institut für Astrophysik, Garching bei München, Germany
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