Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-01-26
Mon.Not.Roy.Astron.Soc. 315 (2000) 751
Astronomy and Astrophysics
Astrophysics
7p, to appear in Monthly Notices
Scientific paper
10.1046/j.1365-8711.2000.03483.x
The X-ray spectrum from a cool disk embedded in an ion supported torus is computed. The interaction of the hot ions with the disk increases the hard X-ray luminosity of the system}. A surface layer of the disk is heated by the protons from the torus. The Comptonized spectrum produced by this layer has a shape that depends only weakly on the incident energy flux and the distance from the accreting compact object. It consists of a `blue bump' of unComptonized soft photons and a flat high energy tail, reminiscent of the observed spectra. The hard tail becomes flatter as the thermalization depth in the cool disk is increased. Further evidence for ion illumination are the Li abundance in the secondaries of low mass X-ray binaries and the 450 keV lines sometimes seen in black-hole transient spectra.
Haardt Francesco
Spruit Hendrik C.
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