The Accretion of Matter by a Collapsing Star in the Presence of a Magnetic Field
Abstract
The exact nonstationary solution for the variation of the magnetic field in the Schwarzschild metric with a given spherically symmetric flow is obtained. Initially a homogeneous magnetic field increases with time, changing into a quasi-radial field. On the assumption of equipartition between the magnetic and kinetic energies of a falling gas, in the relativistic case, estimates of the stationary field and the intensity of synchrotron radiation are presented. A considerable part of the radiation is formed in the relativistic regionr≲(2.5 to 7.7)r g (r g is the gravitational radius of a black hole). Estimates are made for radiation from the relativistic region in the case of disc type accretion.
- Publication:
-
Astrophysics and Space Science
- Pub Date:
- May 1974
- DOI:
- 10.1007/BF00642237
- Bibcode:
- 1974Ap&SS..28...45B