Collimated propagation of magnetohydrodynamic waves near to a Schwarzschild black hole

Details Collimated propagation of magnetohydrodynamic waves near to a Schwarzschild black hole Collimated propagation of magnetohydrodynamic waves near to a Schwarzschild black hole

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..643h&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 6, p. 643-651

Physics

Plasma Physics

5

Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Magnetohydrodynamic Waves, Plasma Physics, Perturbation Theory, Plasma Turbulence, Relativity, Symmetry, Wave Equations, Wave Propagation

Scientific paper

We have studied non-stationary and axisymmetric perturbations of magnetohydrodynamic accretion onto a nonrotating (Schwarzschild) black hole. The unperturbed stationary inflow is assumed to be magnetically dominated, and our analysis is limited to the fast-magnetosonic perturbations produced near to the black hole. The key point is that the plasma accretion can be highly disturbed as a result of a slight perturbation of the poloidal magnetic field. In fact, we find an interesting perturbed structure of the plasma velocity with a large peak in some narrow region just beyond the fast-magnetosonic surface. If the critical surface has an oblate shape for radial poloidal field lines, this perturbation of the plasma motion is induced by outgoing waves propagating from the equatorial super-fast-magnetosonic region to the polar sub-fast-magnetosonic one. Thus,the effective accleration of particles due to the outgoing fast-magnetosonic waves will work mainly in the polar direction as a mechanism to trigger jet production in active galactic nuclei.

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