Comptonization in an accretion disk illuminated by protons

Details Comptonization in an accretion disk illuminated by protons Comptonization in an accretion disk illuminated by protons

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...362....1d&link_type=abstract

Astronomy and Astrophysics, v.362, p.1-8 (2000)

Physics

14

Accretion, Accretion Disks, Black Hole Physics, Radiative Transfer, Scattering, X-Rays: Galaxies, X-Rays: Stars

Scientific paper

We compute the X-ray spectrum from a cool, optically thick, geometrically thin accretion disk embedded in a hot ion supported torus (or ADAF). Most of the gravitational power is assumed to be dissipated in the torus, where the protons are near their local virial temperature. The protons are slowed down in the accretion disk via Coulomb interactions, producing a hot surface layer with an optical thickness tau_T ~1-2. The heating of this layer is balanced by cooling through Comptonization of soft photons. The soft photons are produced by the reprocessing (treated in an approximate way) of hard photons penetrating into the cool disk. Solving the energy balance problem of the heated layer together with the Comptonization by a Monte-Carlo simulation, we find X-ray spectra reminiscent of observed spectra of AGN and black hole candidates in their hard states.

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