Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976natur.262..270z&link_type=abstract
Nature, vol. 262, July 22, 1976, p. 270, 271.
Astronomy and Astrophysics
Astronomy
15
Black Holes (Astronomy), Magnetic Fields, Magnetohydrodynamic Stability, Plasma-Electromagnetic Interaction, Relativistic Plasmas, Energy Dissipation, Gravitational Effects, Kinetic Energy, Lorentz Force, Schwarzschild Metric, Turbulence Effects
Scientific paper
It is shown that for any positive rate of dissipation of turbulent kinetic energy, a magnetic field can hold a plasma in equilibrium at a certain radius greater than that of a Schwarzschild black hole's event horizon. It is also demonstrated that this equilibrium need not be subject to the kind of relativistic instability that destroys circular orbits of radius equal to three times the event-horizon radius. The interaction of a current in a thin disk of plasma at rest in the equatorial plane of a Schwarzschild black hole with a magnetic field generated far from the hole to produce a Lorentz force balancing gravity is analyzed under the assumption that the magnetic field is uniform near the hole. The results indicate that plasma equilibrium is possible and that the plasma disk should be stable if a certain inequality is satisfied. It is concluded that accreting plasma may be in quasi-static equilibrium near some black holes and that this is a consequence of the strength of electromagnetic forces in comparison with that of gravity.
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