Astrophysics and Space Science

, Volume 42, Issue 2, pp 401–424 | Cite as

The accretion of matter by a collapsing star in the presence of a magnetic field. II. Selfconsistent stationary picture

  • G. S. Bisnovatyi-Kogan
  • A. A. Ruzmaikin
Article
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Abstract

The stationary two-dimensional magnetohydrodynamic solution for the accretion of the matter without pressure into a gravitating centre of a black hole is obtained. It is assumed that the magnetic field far from the collapsed star is homogeneous and its influence on the flow is negligible. Around the star, at the plane perpendicular to the direction of the magnetic field, the dense quasistationary disc is formed, the structure of which in a large extent is determined by dissipation processes. The structure is calculated for (a) a laminar disc with the Coulomb mechanism of dissipation; and (b) a turbulent disc.

The estimations of the parameters of the shock which result from the infall of the matter onto the disc are given. In the last section the numerical estimation and approximate character of the radiation spectrum of the disc and the shock are obtained for two cases of 10M⊙ and 105M⊙. The luminosity of collapsed objects withM=10M⊙ appears to be about solar, thus its observation is possibly only at the distances less than 300–1000 pc. The collapsed objects in the Galaxy withM=105M⊙ could constitute very bright sources in spectral regions from optical up to X-ray. The spectra of a laminar and a turbulent disc for 10M⊙ black hole are very different. The laminar disc radiates primarily in the ultraviolet. The turbulent disc radiates a large part of its flux in the infrared. Therefore, one cannot exclude the possibility that some of the galactic infrared star-like sources are individual black holes in the accretion state.

Keywords

Radiation Magnetic Field Black Hole Spectral Region Numerical Estimation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© D. Reidel Publishing Company 1976

Authors and Affiliations

  • G. S. Bisnovatyi-Kogan
    • 1
  • A. A. Ruzmaikin
    • 2
  1. 1.Space Research InstituteU.S.S.R. Academy of ScienceMoscowU.S.S.R.
  2. 2.Institute of Applied MathematicsU.S.S.R. Academy of ScienceMoscowU.S.S.R.

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