AC2 - MHD processes near compact objects |
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Speaker |
Mukhopadhyay, Banibrata |
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Coauthors |
Chatterjee, Koushik |
| Talk Title |
Removal of angular momentum by strong magnetic field stresses in advective accretion flows around black holes |
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Abstract |
We show that the removal of angular momentum is possible in the presence of large scale magnetic stresses, arisen by fields much stronger than that for MRI, in geometrically thick, advective, sub-Keplerian accretion flows around black holes in steady-state, in the complete absence of alpha-viscosity. The efficiency of matter infall and hence an angular momentum transfer in such disks could be equivalent to that of alpha-viscosity with alpha=0.01-0.08. Nevertheless, required field is well below its equipartition value, leading to a magnetically stable disk flow. This is essentially important in order to describe the hard spectral state of the sources. We show in our simpler 1.5-dimensional, vertically averaged disk model that larger the vertical-gradient of azimuthal component of magnetic field, stronger the rate of angular momentum transfer is, which in turn may lead to a faster rate of outflowing matter. |
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