Table of Contents
Universe, Volume 5, Issue 6 (June 2019)
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Cover Story (view full-size image) Three zones around a black hole (BH) during accretion of a gas with a frozen magnetic field, [...] Read more. Three zones around a black hole (BH) during accretion of a gas with a frozen magnetic field, homogeneous at infinity. (I) A zone of stationary hydrodynamic flow with a non-stationary magnetic field. (II) A zone of stationary flow where the transition from subsonic to supersonic flow takes place. (Ill) A zone of stationary supersonic flow. Dashed line marks the place where the velocity reaches the sound value. At the plane perpendicular to the magnetic field direction, a thin disk around BH is formed. In zone II, the disk merges with the surrounding flow. Arrows in the direction of the flow velocity have opposite signs in the lower and upper parts, where the magnetic field has the same direction. The ring-like stagnation zone is shown by horizontal strokes. The sizes of two inner zones are slowly increasing with time. View this paper.