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- W2017408749 abstract "We derive the hydrodynamic equations of a nonmagnetic fluid in a static, Schwarzschild field taking into account electron-positron creation and annihilation. We solve these equations coupled to the radiation intensity equation and obtain consistent solutions that describe the infalling plasma. We find 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/sup 7/ M/sub sun/. The spectrum of the emergent radiation is roughly described by a power law with index > or approx. =1 in the hard X-ray range (E E/sub 0/, where E/sub 0/ depends on the photon-photon optical depth of the cloud. For an optical depth > or approx. =1, E/sub 0/ is typically between 1 and 2 MeV. In the intermediate range (0.1< or approx. =E< or approx. =1 MeV) the spectrum does not fit a simple power law and may include the effect of pairs via an emission feature. We further discuss the relevance of these models to the recent observations of the quasars 3C 273 and QSO 0241+622 and the Syefert galaxy NGC 4151." @default.
- W2017408749 created "2016-06-24" @default.
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- W2017408749 date "1982-01-01" @default.
- W2017408749 modified "2023-10-14" @default.
- W2017408749 title "Stationary spherical symmetric accretion onto massive black holes - The radiation spectrum and luminosity" @default.
- W2017408749 doi "https://doi.org/10.1086/159563" @default.
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