Abstract
Stationary flows of gas accreting onto a compact center are analyzed in the framework of general-relativistic radiation hydrodynamics, under assumptions of spherical symmetry and thin gas approximation. Numerical investigation shows that gas must be abundant in sources with luminosities approaching the Eddington limit. The gas abundance decreases with the increase of compactness of the central core and it can vary from almost 0.03 to 1/3.
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