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Hydromagnetic flows from accretion discs and the production of radio jets

Blandford, R. D. and Payne, D. G. (1982) Hydromagnetic flows from accretion discs and the production of radio jets. Monthly Notices of the Royal Astronomical Society, 199 (4). pp. 883-903. ISSN 0035-8711. doi:10.1093/mnras/199.4.883.

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We examine the possibility that energy and angular momentum are removed magnetically from accretion discs, by field lines that leave the disc surface and extend to large distances. We illustrate this mechanism by solving the equations of magnetohydrodynamics, assuming infinite conductivity, for axially symmetric, self-similar, cold magnetospheric flow from a Keplerian accretion disc in which the field strength B scales with radius r as B ∝r^(-5/4). We show that a centrifugally driven outflow of matter from the disc is possible, if the poloidal component of the magnetic field makes an angle of less than 60° with the disc surface. At large distances from the disc, the toroidal component of the magnetic field becomes important and collimates the outflow into a pair of anti-parallel jets moving perpendicular to the disc. Close to the disc, the flow is probably driven by gas pressure in a hot magnetically dominated corona. In this way, magnetic stresses can extract the angular momentum from a thin accretion disc and thus enable matter to be accreted, independently of the presence of viscosity. These jet solutions have the property that most of the power is concentrated within a central core, while most of the angular momentum and magnetic flux is carried near the jet walls. The relevance of this mechanism for the evolution of accretion discs around massive black holes in galactic nuclei and the production of jets in extragalactic radio sources is described.

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Blandford, R. D.0000-0002-1854-5506
Additional Information:© 1982 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1981 August 19. We thank J. Bardeen for sending us a helpful description of unpublished calculations of hydrodynamical flows above accretion discs, R. Flammang for several useful discussions on critical point theory and D. MacDonald for assistance with some of the numerical work. We also thank the Director of the Institute of Astronomy, Cambridge, for hospitality during the summers of 1979 and 1981. This work was supported in part by NSF grant AST 80-17752. R.D.B. is an Alfred P. Sloan Foundation Research Fellow.
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NSFAST 80-17752
Alfred P. Sloan FoundationUNSPECIFIED
Issue or Number:4
Record Number:CaltechAUTHORS:20190521-165453163
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Official Citation:R. D. Blandford, D. G. Payne, Hydromagnetic flows from accretion discs and the production of radio jets, Monthly Notices of the Royal Astronomical Society, Volume 199, Issue 4, 1 August 1982, Pages 883–903,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95664
Deposited By: George Porter
Deposited On:23 May 2019 15:11
Last Modified:16 Nov 2021 17:14

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