Time variation of magnetohydrodynamic accretion onto a black hole

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

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasj...45..431h&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 45, no. 3, p. 431-441.

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6

Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Magnetohydrodynamics, Computational Astrophysics, Electromagnetic Fields, Perturbation Theory, X Ray Spectra

Scientific paper

The non-stationary and non-axisymmetric perturbations of magnetohydrodynamic (MHD) accretion onto a Kerr black hole are studied. We regard a small-amplitude fluctuation of the electromagnetic field as being a source of perturbations in a magnetosphere and examine how the plasma accretion is affected by it along a flow line, especially at the fast-magnetosonic point in the short-wavelength limit. Assuming that the magnetic field dominates the plasma accretion, we find that the meridional current becomes large near to the fast-magnetosonic point located close to the horizon. This is due to the effects of the particle's inertia and the strong gravity near the horizon. As a consequence, the fluid suffers a large radial acceleration resulting from the Lorentz force, and becomes highly variable compared with the electromagnetic field there. This variable nature of the plasma accretion may be responsible for the variability of the higher energy X-rays observed from a galactic black hole candidate (GBHC) or an active galactic nucleus (AGN).

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