Shock formation in magnetohydrodynamical accretion onto a black hole

Details Shock formation in magnetohydrodynamical accretion onto a black hole Shock formation in magnetohydrodynamical accretion onto a black hole

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppcn.conf..391y&link_type=abstract

In ESA, Fourth International Toki Conference on Plasma Physics and Controlled Nuclear Fusion p 391-394 (SEE N94-22624 05-75)

Astronomy and Astrophysics

Astronomy

Black Holes (Astronomy), Magnetohydrodynamic Flow, Magnetohydrodynamic Waves, Shock Waves, Stellar Magnetic Fields, Stellar Mass Accretion, Stellar Rotation, X Ray Spectra, Active Galactic Nuclei, Angular Momentum, Mach Number, Magnetohydrodynamic Stability, X Ray Astronomy

Scientific paper

Magnetohydrodynamic (MHD) accretion onto a black hole is studied. The general relativistic MHD accretion was calculated by a numerical method. By using the new method of calculation, the angular momentum of the fluid generated by the black hole which is placed in the static medium with the uniform density and the uniform magnetic field is studied. The interaction between the magnetic field and the fluid matter in the rotating space time enhances the energy for the fluid and reduces the energy for the magnetic field. The rapidly rotating black hole produces the negative energy region in the distribution of the energy density for the magnetic field. The magnetic field transports the energy and the angular momentum from the stretched horizon to the outer atmosphere. The asymmetry of the flow increases the critical Mach number: MAC much greater than one. The MHD accretion with an initially uniform magnetic field produces the peaks of the magnetic stress near the event horizon. The perturbations at the peaks grow at MAC = 30. The gas energy density perturbs the MHD flow and generates the shock waves. The shock waves generated near the horizon may produce the large amount of X ray emission. The emission mechanism of the X ray radiation from the black hole candidates is discussed with the MHD accretion model.

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