Magnetic alignment of rotating black holes and accretion discs

Details Magnetic alignment of rotating black holes and accretion discs Magnetic alignment of rotating black holes and accretion discs

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....58..175k&link_type=abstract

Astronomy and Astrophysics, vol. 58, no. 1-2, June 1977, p. 175-179. Research supported by the Deutsche Forschungsgemeinschaft.

Astronomy and Astrophysics

Astrophysics

16

Astrophysics, Black Holes (Astronomy), Interstellar Magnetic Fields, Relativistic Effects, Stellar Mass Accretion, Torque, Maxwell Equation, X Ray Sources

Scientific paper

A global theorem due to Hawking (1973) implies the existence of a relative torque between a rotating black hole and a non-axisymmetrically positioned magnetic field which attempts to bring the system into an axisymmetric configuration. We calculate this torque for the case of a uniform magnetic field, thereby confirming a conjecture of Press (1972). We apply our results to the problem of a tilted accretion disk around a Kerr black hole, showing how currents in the disk could in principle lead to the alignment of its inner region with the axis of the hole. An estimate shows however that the effect is likely to be unimportant for conventional stationary-disk models of X-ray sources.

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