Article (Scientific journals)
The XMM large scale structure survey: properties and two-point angular correlations of point-like sources
Gandhi, P.; Garcet, Olivier; Disseau, L. et al.
2006In Astronomy and Astrophysics, 457 (2), p. 393-404
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Keywords :
large-scale structure of Universe; galaxies: Seyfert; X-rays: diffuse background
Abstract :
[en] We analyze X-ray sources detected over 4.2 pseudo-contiguous sq. deg. in the 0.5-2 keV and 2-10 keV bands down to fluxes of 2× 10[SUP]-15[/SUP] and 8× 10[SUP]-15[/SUP] erg s[SUP]-1[/SUP] cm[SUP]-2[/SUP] respectively, as part of the XMM-Newton Large Scale Structure Survey. The log N-log S in both bands shows a steep slope at bright fluxes, but agrees well with other determinations below ~2 × 10[SUP]-14[/SUP] erg s[SUP]-1[/SUP] cm[SUP]-2[/SUP]. The detected sources resolve close to 30 per cent of the X-ray background in the 2-10 keV band. We study the two-point angular clustering of point sources using nearest neighbours and correlation function statistics and find a weak, positive signal for ~1130 sources in the 0.5-2 keV band, but no correlation for ~400 sources in the 2-10 keV band below scales of 100 arcsec. A sub-sample of ~200 faint sources with hard X-ray count ratios, that is likely to be dominated by obscured AGN, does show a positive signal with the data allowing for a large angular correlation length, but only at the ~2 (3)sigma level, based on re-sampling (Poisson) statistics. We discuss possible implications and emphasize the importance of wider, complete surveys in order to fully understand the large scale structure of the X-ray sky.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Gandhi, P.;  Institute of Astronomy, Madingley Road, University of Cambridge, CB3 0HA, UK ; European Southern Observatory, Casilla 19001, Santiago, Chile
Garcet, Olivier ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Disseau, L.;  École Normale Supérieure, Paris, France ; European Southern Observatory, Casilla 19001, Santiago, Chile
Pacaud, F.;  CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, 91191 Gif-sur-Yvette, France
Pierre, M.;  CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, 91191 Gif-sur-Yvette, France
Gueguen, A.;  CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, 91191 Gif-sur-Yvette, France
Alloin, D.;  CEA/DSM/DAPNIA, Service d'Astrophysique, Saclay, 91191 Gif-sur-Yvette, France ; European Southern Observatory, Casilla 19001, Santiago, Chile
Chiappetti, L.;  INAF IASF Milano, via Bassini 15, 20133 Milano, Italy
Gosset, Eric ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE)
Maccagni, D.;  INAF IASF Milano, via Bassini 15, 20133 Milano, Italy
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Valtchanov, I.;  Astrophysics group, Blackett Laboratory, Imperial College, London, UK
Language :
English
Title :
The XMM large scale structure survey: properties and two-point angular correlations of point-like sources
Publication date :
October 2006
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
457
Issue :
2
Pages :
393-404
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 10 March 2011

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