Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..284l&link_type=abstract
In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc
Astronomy and Astrophysics
Astronomy
Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Gas Viscosity, Momentum Transfer, Radiative Transfer, Angular Momentum, Gas Flow, Kinetic Theory, Optical Thickness
Scientific paper
Angular momentum transport by photons is analyzed for thin and thick configurations of steady accretion flows near black holes. The radiative viscosity coefficient is derived accurately from kinetic theory for arbitrary photon spectra. Thin Keplerian disks cannot be supported by radiative viscosity. However, in a quasi-spherical accretion most of the initial angular momentum of the gas can be transported away by the photons it produces, allowing gas flow towards the central black hole. Compton drag can also be effective in the outer optically-thin part of the flow. The radiative transport of angular momentum may provide the needed accretion to fuel massive black holes with gas in AGN.
Laor Ari
Loeb Abraham
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