Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-04-03
Astronomy and Astrophysics
Astrophysics
33 pages, 9 Postscript figures, to appear in ApJ, September 1997
Scientific paper
10.1086/304502
Two families of models of dusty tori in AGNs (moderately thick and extended versus very thick and compact) are tested against available observations. The confrontation suggests that the former class better explains the IR broad-band spectra of both broad and narrow line AGNs, the anisotropy of the emission deduced by comparing IR properties of Seyfert 1 and 2 nuclei, the results of IR spectroscopy and those of high spatial resolution observations. There is however clear evidence for a broad distribution of optical depths. We also examine the relationship between IR and X-ray emission. The data support a view in which the matter responsible for the X-ray absorption is mostly dust free, lying inside the dust sublimation radius. The consequences of these results for the hard X-ray background as well as IR counts and background are discussed.
Danese Luigi
Franceschini Alberto
Granato Gian Luigi
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