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Quasi-stationary flows of gas accreting onto a compact center are analyzed inthe framework of general-relativistic radiation hydrodynamics, underassumptions of spherical symmetry and thin gas approximation. Numericalinvestigation shows that luminosity, redshift and gas abundance are correlated.The gas can constitute up to one third of the total mass of brightestlow-redshift sources, but its abundance goes down to 1/30 for sources withluminosities close to the Eddington limit.

Luminosity, redshift and gas abundance in general relativistic radiation hydrodynamics