Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.338.1013s&link_type=abstract
Monthly Notice of the Royal Astronomical Society, Volume 338, Issue 4, pp. 1013-1024.
Astronomy and Astrophysics
Astronomy
18
Accretion, Accretion Discs, Radiative Transfer
Scientific paper
The vertical structure and the emission spectrum of slim accretion discs around massive black holes are investigated for super-critical accretion states. A key process is the effect of photon trapping, which is included in the radiative transfer equation. It is found that the local radiation spectrum emitted from the inner region has a typical Comptonized bremsstrahlung form, and deviates significantly from the blackbody and the modified blackbody spectrum. The spectral hardening factor of the local spectrum has a large radial dependence: it takes a value of ~104 (inner region) and ~3 (outer region). Owing to the effect of photon trapping, the emergent luminosity becomes small compared with the gravitational energy released through viscosity. The effect is remarkable for a large accretion rate and a spin parameter close to unity. In particular, for an extreme Kerr case with an accretion rate of 100LEdd/c2, where LEdd is the Eddington luminosity, the emergent luminosity is approximately 2 per cent of the released energy. A comparison with the standard model is also discussed for an accretion rate under the Eddington limit.
Manmoto Tadahiro
Shimura Toshiya
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