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2002MNRAS.332..799R - Mon. Not. R. Astron. Soc., 332, 799-813 (2002/June-1)
The structure and radiation spectra of illuminated accretion discs in active galactic nuclei - I. Moderate illumination.
ROZANSKA A., DUMONT A.-M., CZERNY B. and COLLIN S.
Abstract (from CDS):
We show that exact calculations of hydrostatic equilibrium and determination of the disc thickness have a crucial impact on the optical depth of the hot illuminated zone. We study the lamp-post model for a low (m{dot} =0.03) and high (m{dot} =0.3) accretion rate. In both cases we assume a moderate illumination where the viscous flux equals the X-ray radiation flux. A highly ionized skin is created in the lamp-post model, with the outgoing spectrum containing many emission lines and ionization edges in emission or absorption in the soft X-ray domain, as well as an iron line at ∼7keV consisting of a blend of a low-ionization line from the deepest layers and hydrogen- and helium-like resonance lines from the upper layers, and almost no absorption edge, contrary to the case of a slab of constant density. A full heavy corona completely suppresses the highly ionized zone on the top of the accretion disc and in such a case the spectrum is featureless.
Abstract Copyright: 2002 Blackwell Science Ltd
Journal keyword(s): accretion, accretion discs - black hole physics - galaxies: active - quasars: general - galaxies: Seyfert - X-rays: galaxies
Simbad objects: 4
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