2012A&A...537A.131E


Query : 2012A&A...537A.131E

2012A&A...537A.131E - Astronomy and Astrophysics, volume 537A, 131-131 (2012/1-1)

Angular correlation functions of X-ray point-like sources in the full exposure XMM-LSS field.

ELYIV A., CLERC N., PLIONIS M., SURDEJ J., PIERRE M., BASILAKOS S., CHIAPPETTI L., GANDHI P., GOSSET E., MELNYK O. and PACAUD F.

Abstract (from CDS):

Our aim is to study the large-scale structure of different types of AGN using the medium-deep XMM-LSS survey. We measure the two-point angular correlation function of ∼5700 and 2500 X-ray point-like sources over the ∼11 sq. deg. XMM-LSS field in the soft (0.5-2keV) and hard (2-10keV) bands. For the conversion from the angular to the spatial correlation function we used the Limber integral equation and the luminosity-dependent density evolution model of the AGN X-ray luminosity function. We have found significant angular correlations with the power-law parameters γ=1.81±0.02, θ0=1.3"±0.2" for the soft, and γ=2.00±0.04, θ0=7.3"±1.0" for the hard bands. The amplitude of the correlation function w(θ) is higher in the hard than in the soft band for fx≲10–14erg/s/cm2 and lower above this flux limit. We confirm that the clustering strength θ0 grows with the flux limit of the sample, a trend which is also present in the amplitude of the spatial correlation function, but only for the soft band. In the hard band, it remains almost constant with r0≃10h–1Mpc, irrespective of the flux limit. Our analysis of AGN subsamples with different hardness ratios shows that the sources with a hard-spectrum are more clustered than soft-spectrum ones. This result may be a hint that the two main types of AGN populate different environments. Finally, we find that our clustering results correspond to an X-ray selected AGN bias factor of ∼2.5 for the soft band sources (at a median z≃1.1) and ∼3.3 for the hard band sources (at a median z≃1), which translates into a host dark matter halo mass of ∼1013h–1M and ∼1013.7h–1M for the soft and hard bands, respectively.

Abstract Copyright:

Journal keyword(s): X-rays: galaxies - galaxies: active - surveys

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 ELAIS S1 reg 00 34 44 -43 28.2           ~ 177 0
2 NAME XMM-LSS Field reg 02 18 00 -07 00.0           ~ 211 0
3 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 2552 0

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2022.08.09-03:52:51

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