Mukhopadhyay, B and Chatterjee, K (2018) Removal of angular momentum by strong magnetic field stresses in advective accretion flows around black holes. In: 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings, 12 - 18 July 2015, Rome, pp. 1108-1113.
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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 required for magnetorotational instability, in geometrically thick, advective, sub-Keplerian accretion flows around black holes in steady-state, in the complete absence of alpha-viscosity. The efficiency of such angular momentum transfer via Maxwell stress, with the field well below its equipartition value, could be equivalent to that of alpha-viscosity, arisen via Reynolds stress, with α = 0.01 − 0.08. We find in our simpler vertically averaged advective disk model that stronger the magnetic field and/or 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, which has important implications to describe the hard spectral states of black hole sources. When the generic origin of alpha-viscosity is still being explored, mechanism of efficient angular momentum transfer via magnetic stresses alone is very interesting.
| Item Type: | Conference Paper |
|---|---|
| Publication: | 14th Marcel Grossman Meeting On Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Proceedings |
| Publisher: | World Scientific Publishing Co. Pte. Ltd. |
| Additional Information: | The copyright for this article belongs to the Authors. |
| Keywords: | Astrophysics; Gravitation; Jets; Magnetic fields; Magnetohydrodynamics; Momentum transfer; Relativity; Reynolds number; Stars; Viscosity, Accretion; Accretion disks; Galaxies : active; Outflows; X-rays: Binaries, Angular momentum |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 01 Sep 2022 10:21 |
| Last Modified: | 01 Sep 2022 10:21 |
| URI: | https://eprints.iisc.ac.in/id/eprint/76352 |
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