Statistics – Computation
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...372..424p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 372, May 10, 1991, p. 424-447.
Statistics
Computation
24
Accretion Disks, Black Holes (Astronomy), Computational Astrophysics, Interstellar Magnetic Fields, Magnetohydrodynamic Flow
Scientific paper
This article investigates the accretion of a tenuous plasma toward a rotating black hole in the presence of a large-scale magnetic field. It is demonstrated that when a steady source of plasma is injected into the magnetosphere, an outgoing wind which is powered by the rotational energy of the black hole will propagate toward infinity. The energy extraction via the accretion of injected plasma is accomplished by a dissipative coupling between the large-scale magnetic field and the gravitational field of the hole. This analysis is contrasted to previous models of ideal MHD coupling to the hole. It is argued, for a rapidly rotating black hole with a mass of about 10 to the 8th - 10 to the 9th solar masses and a magnetic field strength of about 10,000 G, near the horizon, that an energy flux of about 10 to the 43rd ergs/s can be transported by the outgoing wind. If the energy in this wind dissipates in a radio jet or in extended radio emission, a possible central engine for the radio emission in weak-to-moderate radio galaxies and radio-loud quasars is at hand.
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