AGN X-ray absorption vs. optical classification: Hints from the XRB models

Details AGN X-ray absorption vs. optical classification: Hints from the XRB models AGN X-ray absorption vs. optical classification: Hints from the XRB models

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..599..626g&link_type=abstract

X-RAY ASTRONOMY: Stellar Endpoints,AGN, and the Diffuse X-ray Background. Edited by Nicholas E. White, Giuseppe Malaguti, and G

Astronomy and Astrophysics

Astronomy

Galactic Nuclei, Circumnuclear Matter, And Bulges, X-Ray Sources, X-Ray Bursts, Background Radiations, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies

Scientific paper

We present a synthesis model of the cosmic X-ray background (XRB) with Active Galactic Nuclei (AGNs) where the evolution of absorbed AGNs is assumed to be faster than that of unabsorbed AGNs and to stop at a lower redshift. The model provides a good description of the XRB spectrum over the broadband 1-100 keV and is in agreement with the AGN counts in the three different bands 0.5-2 keV, 2-10 keV and 5-10 keV, covered by recent X-ray surveys. We also find a relation between optical classification and X-ray absorption of AGNs, which reproduces the fractions of the different optical types observed in the X-ray surveys. As a result of our investigation, among the AGNs optically classified as type 1, the fraction of objects with X-ray absorbed spectra seems to increase with the redshift. .

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