2006A&A...459..693A


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.13CET14:09:29

2006A&A...459..693A - Astronomy and Astrophysics, volume 459, 693-701 (2006/12-1)

XMM-Newton and Chandra measurements of the AGN intrinsic absorption: dependence on luminosity and redshift.

AKYLAS A., GEORGANTOPOULOS I., GEORGAKAKIS A., KITSIONAS S. and HATZIMINAOGLOU E.

Abstract (from CDS):

We combine bright XMM-Newton data with the Chandra Deep Field South observations to explore the behavior of the intrinsic AGN absorption, as a function of redshift and luminosity. Our sample consists of 359 sources selected in the hard 2-8 keV band, spanning the flux range 6x10–16-3x10–13erg/cm2/s with a high rate of spectroscopic or photometric redshift completeness (100 and 85 per cent respectively for the Chandra and XMM-Newton data). We derive the column density values using X-ray spectral fits. We find that the fraction of obscured AGN falls with increasing luminosity in agreement with previous findings. The fraction of obscured AGN shows an apparent increase at high redshifts (z>2). Simulations show that this effect can most probably be attributed to the fact that at high redshifts the column densities are overestimated.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/459/693): table2.dat>

Nomenclature: Table 2: [AGG2006] NNN (Nos 1-153).

Status in Simbad:  could be processed

Simbad objects: 4

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Number of rows : 4

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 [LBX2017] 73 AGN 03 31 57.059 -27 51 08.26       26.3   ~ 18 0
2 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1764 1
3 NAME Chandra Deep Field-North reg 12 36.8 +62 13           ~ 602 0
4 NAME Extended Groth Strip reg 14 19 +52.8           ~ 553 0

    Equat.    Gal    SGal    Ecl

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2019.12.13-14:09:29

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