Time variation of MHD accretion onto a black hole

Details Time variation of MHD accretion onto a black hole Time variation of MHD accretion onto a black hole

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppcn.conf..363h&link_type=abstract

In ESA, Fourth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion p 363-366 (SEE N94-22624 05-75)

Astronomy and Astrophysics

Astronomy

Active Galactic Nuclei, Black Holes (Astronomy), Electromagnetic Fields, Magnetohydrodynamic Flow, Magnetohydrodynamics, Perturbation Theory, Stellar Mass Accretion, X Ray Spectra, Active Galaxies, Dense Plasmas, Lorentz Force, Magnetic Field Configurations, Stellar Spectra

Scientific paper

Nonstationary and nonaxisymmetric perturbations of magnetohydrodynamic (MHD) accretion onto a Kerr black hole are studied. A small amplitude fluctuation of the electromagnetic field is regarded as a source of perturbations in a magnetosphere. How the plasma accretion will be affected by it along a flow line especially at the fast magnetosonic point in the short wave length limit is examined. A stationary black hole magnetosphere, in which the MHD interaction is so effective that typically ten of the fluid's rest mass energy will be transported to the magnetic field, is described. Adopting the magnetically dominated limit that the energy density of the magnetic field dominates the rest mass energy density of plasma particles, the electromagnetic perturbations are described. Using this result, it is shown that the fluid energy, angular momentum, and poloidal velocity become highly variable near the fast magnetosonic point in the magnetically dominated limit. This is because the radial variation of the meridional current becomes significant and causes large Lorentz force on the fluid. The observed short term variations of X ray emission from GBHCs (galactic black hole candidates) and/or active galactic nuclei are discussed.

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