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Black hole accretion disks : sources of viscosity and signatures of super-Eddington accretion

Dominikus Heinzeller
The results reveal that convection supports the radiative energy transport efficiently in massless disks, while it can turn into a negative feedback if self-gravity becomes important.  ...  We confirm the diagnostic power of the iron K lines on the accretion process in the inner disk region, finding a strong correlation between the central black hole mass and the ratio of the K α to the K  ...  Also, the general question if the MRI effects can be translated into an αor β-type viscosity (as a rule of thumb, β ≈ α 2 . . . α) remains to be answered (see, e. g., Pessah et al. (2008) ).  ... 
doi:10.11588/heidok.00008575 fatcat:bblu5wkvzzbc3ds3q637lf4p6i