Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.277.1169c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 277, Issue 3, pp. 1169-1176.
Astronomy and Astrophysics
Astronomy
15
Galaxies: Active, Quasars: General, Galaxies: Seyfert, Infrared: Galaxies, X-Rays: General
Scientific paper
We discuss the possibility that the major energy contribution to the hard X-ray background (XRB) is the integrated emission from a mixed population of obscured and unobscured active galactic nuclei (AGN), as predicted by the Seyfert unification scheme. The model assumes that AGN are compact and in thermal pair equilibrium, and that the source compactness (i.e. the luminosity-to-size ratio) undergoes evolution following the X-ray luminosity evolution. Owing to the process of pair production, the model predicts evolution in the spectral properties, which are self-consistently taken into account. The XRB emission can be accounted for by a population with a relatively limited range of temperatures, around a few hundred keV. Finally, we estimate the number counts predicted in the IR band and the contribution of this population of AGN to the diffuse IR background, as a result of re-emission of the absorbed high-energy radiation.
Celotti Annalisa
Fabian Andrea C.
Ghisellini Gabriele
Madau Piero
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