The Accretion of Matter by a Collapsing Star in the Presence of a Magnetic Field

Details The Accretion of Matter by a Collapsing Star in the Presence of a Magnetic Field The Accretion of Matter by a Collapsing Star in the Presence of a Magnetic Field

May 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974ap%26ss..28...45b&link_type=abstract

Astrophysics and Space Science, Volume 28, Issue 1, pp.45-59

Astronomy and Astrophysics

Astrophysics

68

Scientific paper

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.

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