Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprn17107r&link_type=abstract
American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As
Astronomy and Astrophysics
Astrophysics
Scientific paper
Radiation dominated accretion disks are likely to be subject to the ``photon bubble'' instability which may lead to strong density inhomogeneities on scales much shorter than the disk scale height. Such disks could radiate well above the Eddington limit without being disrupted. Existing estimates of the Eddington enhancement factor assume that the radiative diffusion approximation applies locally throughout the atmosphere. We relax this assumption and carry out analytical and Monte Carlo study of the effects of flux-limited diffusion in highly inhomogeneous disk atmospheres and calculate the corresponding Eddington enhancement factor. The derived radiation field will enable us to address the issue of the coupling of density inhomogeneities and radiation, i.e. the effect of radiation on the structure and propagation of the inhomogeneities.
Begelman Mitchell
Ruszkowski Mateusz
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