Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011xau5.confe..16c&link_type=abstract
"The Second Ferrara Workshop on "X-ray Astrophysics up to 511 keV", held in Ferrara (Italy), September 14 - 16, 2011, article #1
Astronomy and Astrophysics
Astrophysics
Scientific paper
The fraction of the hard X-ray background (XRB) resolved into discrete sources strongly depends from the considered energy range While around a few keV deep Chandra and XMM surveys have essentially resolved the entire XRB flux above 7-8 keV no more than 50% of the flux is due to resolved sources. At energies greater than 10 keV, where the bulk of the CXB energy density is produced, the resolved fraction is negligible, being strongly limited by the lack of imaging X-ray observations. I will review the present status of AGN synthesis models for the XRB and in particular the uncertainties related to high-energy (>100 keV) continuum spectrum and absorption distribution at high column densities. I will discuss how high energy (above a few tens of keV) observations will improve our present understanding of the physical mechanisms associated to the AGN primary emission mechanism and the cosmological evolution of the most obscured sources.
Comastri Andrea
Gilli Roberto
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