2009A&A...500..749E


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.18CET00:55:45

2009A&A...500..749E - Astronomy and Astrophysics, volume 500, 749-762 (2009/6-3)

High-precision multi-band measurements of the angular clustering of X-ray sources.

EBRERO J., MATEOS S., STEWART G.C., CARRERA F.J. and WATSON M.G.

Abstract (from CDS):

We aim to study the large-scale structure of an extragalactic serendipitous X-ray survey with unprecedented accuracy thanks to the large statistics involved, and provide insight into the environment of AGN at the epochs when their space density declines (z∼1-2). In this paper we present the two-point angular correlation function of the X-ray source population of 1063 XMM-Newton observations at high Galactic latitudes, comprising up to ∼30000 sources over a sky area of ∼125.5 deg2, in three energy bands: 0.5-2 (soft), 2-10 (hard), and 4.5-10 (ultrahard) keV. This is the largest survey of serendipitous X-ray sources ever used for clustering analysis. We have measured the angular clustering of our survey and find significant positive clustering signals in the soft and hard bands (∼10σ and ∼5σ, respectively), and a marginal clustering detection in the ultrahard band (<1σ). We find dependency of the clustering strength on the flux limit and no significant differences in the clustering properties between sources with high hardness ratios (and therefore likely to be obscured AGN) and those with low hardness ratios. We deprojected the angular clustering parameters via Limber's equation to compute their typical spatial lengths. From that we have inferred that AGN at redshifts of ∼1 are embedded in dark matter haloes with typical masses of <logMDMH≥∼12.60±0.34h–1M and lifetimes of tAGN=3.1-4.5x108yr. Our results show that obscured and unobscured objects share similar clustering properties and therefore they both reside in similar environments, in agreement with the unified model of AGN. The short AGN lifetimes derived suggest that AGN activity might be a transient phase that can be experienced several times by a large fraction of galaxies throughout their lives.

Abstract Copyright:

Journal keyword(s): surveys - X-rays: general - cosmology: large-scale structure of Universe - galaxies: active

Simbad objects: 10

goto Full paper

goto View the reference in ADS

Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ELAIS S1 reg 00 34 44 -43 28.2           ~ 151 0
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 10581 1
3 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9107 1
4 M 33 GiG 01 33 50.904 +30 39 35.79 6.17 6.27 5.72     ~ 5026 1
5 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1753 1
6 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14346 1
7 NAME COSMOS Field reg 10 00 28.60 +02 12 21.0           ~ 1894 0
8 NAME Lockman Hole reg 10 45 00.0 +58 00 00           ~ 732 0
9 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5662 0
10 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 601 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2009A&A...500..749E and select 'bookmark this link' or equivalent in the popup menu


2019.11.18-00:55:45

© Université de Strasbourg/CNRS

    • Contact