Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.2702t&link_type=abstract
American Astronomical Society, HEAD meeting #10, #27.02
Astronomy and Astrophysics
Astronomy
Scientific paper
It is now clear that most of the X-ray "background" is created by the combined emission of previously-unresolved AGN, a large fraction of them obscured at X-ray energies. While the basic idea has been clear for 20 years, there is still discussion about the parameters used and assumptions made in order to explain the extragalactic X-ray background emission using AGN. Here I review the most recent AGN population synthesis models that explain the X-ray background, and quantify what these models tell us about the underlying AGN population. In particular, I will focus on the distribution of neutral hydrogen column density along the line of sight and how it is constrained by the X-ray background intensity and spectral shape. I also discuss the degeneracy between the space density of Compton-thick AGN and the normalization of the Compton reflection component, and how we can use hard X-ray surveys for Compton-thick AGN to disentangle them.
This work was made possible by support from ESO through the fellowship program and from NASA/INTEGRAL grant NNG05GM79G.
Treister Ezequiel
Urry Claudia
Virani Shanil
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