Stationary spherical symmetric accretion onto massive black holes - The radiation spectrum and luminosity

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Black Holes (Astronomy), Hydrodynamic Equations, Radiation Spectra, Stellar Mass Accretion, X Ray Spectra, Electrons, Luminosity, Magnetohydrodynamics, Plasma Heating, Positron Annihilation, Radiant Flux Density, Schwarzschild Metric

Scientific paper

Hydrodynamic equations are derived of a nonmagnetic fluid in a static, Schwarzschild field taking into account electron-positron creation and annihilation. Solutions are given to these equations coupled to the radiation intensity equation; consistent solutions are obtained that describe the infalling plasma. It is found that the efficiency of conversion of gravitational energy into radiation energy can be a few percent, provided the mass of the central object is greater than 10 to the 7th solar masses. The spectrum of the emergent radiation is roughly described by a power law with the index greater than approximately one in the hard X-ray range.

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