The Cosmological Evolution of AGNs: Predictions from Galaxy Formation Models

Details The Cosmological Evolution of AGNs: Predictions from Galaxy Formation Models The Cosmological Evolution of AGNs: Predictions from Galaxy Formation Models

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1126..215m&link_type=abstract

SIMBOL-X: FOCUSING ON THE HARD X-RAY UNIVERSE: Proceedings of the 2nd International Simbol-X Symposium. AIP Conference Proceedi

Mathematics

Logic

Galactic Nuclei, Circumnuclear Matter, And Bulges, Galaxy Groups, Clusters, And Superclusters, Large Scale Structure Of The Universe, Star Formation, Infall, Accretion, And Accretion Disks

Scientific paper

We compute the effect of the galactic absorption on AGN emission in a cosmological context by including a physical model for AGN feeding and feedback in a semi-analytic model of galaxy formation. This is based on galaxy interactions as triggers for AGN accretion, and on expanding blast waves as a mechanism to propagate outwards the AGN energy injected into the interstellar medium at the center of galaxies.
We investigate the dependence of the absorbing column density NH associated to cold galactic gas (and responsible for the Compton-thin component of the overall obscuration) on the AGN luminosity and redshift. We find that the absorbed fraction of AGNs with NH>=1022 cm-2 decreases with luminosity for z<=1 in addition, the total (integrated over luminosity) absorbed fraction increases with redshift up to z~2, and saturates to the value ~0.8 at higher redshifts. Finally, we predict the luminosity dependence of the absorbed fraction of AGNs with LX<=31044 erg/s to weaken with increasing redshift.

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