Reference : Angular Clustering of Obscured Active Galactic Nuclei
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Angular Clustering of Obscured Active Galactic Nuclei
Gandhi, Poshak [Institute of Astronomy, UK and ESO, Chile]
Garcet, O. [Institut d'Astrophysique et de Geophysique, Universite de Liege, Belgium]
Disseau, L. [Ecole Normale Superieure, France]
Pacaud, F. [CEA/DSM/DAPNIA, Service d'Astrophysique, France]
Pierre, M. [CEA/DSM/DAPNIA, Service d'Astrophysique, France]
Gueguen, A. [CEA/DSM/DAPNIA, Service d'Astrophysique, France]
Alloin, D. [CEA/DSM/DAPNIA, Service d'Astrophysique, France]
Chiappetti, L. [INAF IASF, Italy]
Gosset, Eric mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Groupe d'astrophysique des hautes énergies (GAPHE) >]
Maccagni, D. [INAF IASF, Italy]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Valtchanov, I. [Astrophysics Group, Blackett Lab., Imperial College, United Kingdom]
Bulletin of the American Astronomical Society, Vol. 38
American Astronomical Society, HEAD meeting #9, #7.44
[en] We describe the properties of X-ray point-like sources detected over 4.2 sq. degs. of the largest contiguous survey with XMM-Newton to date (the XMM-LSS survey) to fluxes of F[SUB]2-10 keV[/SUB] 8x10[SUP]-15[/SUP] erg/s/cm[SUP]2[/SUP] and F[SUB]0.5-2 keV[/SUB] 2x10[SUP]-15[/SUP] erg/s/cm[SUP]2[/SUP] respectively. For 1200 sources in the soft band, we find a two-point angular correlation function (ACF) signal similar to previous work, but no correlation for 400 sources in the hard band. A sample of 200 faint sources with hard X-ray spectra does show a 2-3 sigma positive signal with a power-law normalization theta[SUB]0[/SUB]>40 arcsec. We discuss implications, including the fact that a large correlation length for obscured AGN is inconsistent with simple AGN Unification based on orientation only.
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