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

Abstract

We combine bright XMM data with the Chandra Deep Field South observations in order 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 6\times10^{-16}-$3\times10^{-13} erg s^-1 cm^-2 with a high rate of spectroscopic or photometric redshift completeness (100 and 85 per cent respectively for the Chandra and XMM 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 be most probably attributed to the fact that at high redshifts the column densities are overestimated.

arXiv comment14 pages, 9 figures, A&A accepted

References in corpus (27)

• Cosmological Evolution of the Hard X-ray AGN Luminosity Function and the Origin of the Hard X-ray Background
• The Chandra Deep Field-North Survey. XIII. 2 Ms Point-Source Catalogs
• Luminosity-dependent evolution of soft X-ray selected AGN: New Chandra and XMM-Newton surveys
• The Chandra Deep Field South: the 1 Million Second
• The Chandra Deep Field South: Optical Spectroscopy I
• The distribution of absorbing column densities among Seyfert 2 galaxies
• Resolving the extragalactic hard X-ray background
• The Cosmic Evolution of Hard X-ray Selected Active Galactic Nuclei
• The HELLAS2XMM survey. VII. The hard X-ray luminosity function of AGN up to z=4: more absorbed AGN at low luminosities and high redshifts
• Optical and Infrared Properties of the 2 Ms Chandra Deep Field-North X-ray Sources
• The luminosity dependence of the Type 1 AGN fraction
• The HELLAS2XMM survey: IV. Optical identifications and the evolution of the accretion luminosity in the Universe
• Testing current synthesis models of the X-ray background
• Obscured AGN and the X-ray, Optical and Far-Infrared Number Counts of AGN in the GOODS Fields
• An improved method of constructing binned luminosity functions
• Photometric Redshift of X-Ray Sources in the Chandra Deep Field South
• The HELLAS2XMM survey: VI. X-ray absorption in the 1dfAGN sample through a spectral analysis
• Connecting Galaxy Evolution, Star Formation and the X-ray Background
• The X-Ray Derived Cosmological Star Formation History and the Galaxy X-Ray Luminosity Functions in the Chandra Deep Fields North and South
• X-ray Bright Optically Inactive Galaxies (XBONG) in XMM-Newton/SDSS fields: more diluted than absorbed?
• The XMM-Newton/2dF survey I: X-ray properties of normal galaxies
• The XMM-Newton/2dF survey - II. The nature of X-ray faint optically bright X-ray sources
• The Deep Chandra Survey of the Groth Strip - II. optical identification of the X-ray sources
• Exploring the spectral properties of faint hard X-ray sources with XMM-Newton
• The XMM-Newton/2dF survey IV. The X-ray spectral properties of the hard sources
• On the use of photometric redshifts for X-ray selected AGNs
• Red AGN in XMM-Newton/SDSS fields

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