Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...384..115l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 384, Jan. 1, 1992, p. 115-128.
Astronomy and Astrophysics
Astronomy
25
Accretion Disks, Black Holes (Astronomy), Stellar Physics, Photons, Radiative Transfer, Viscosity
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 toward the central black hole. Nearly spherical accretion may therefore result from more general boundary conditions than usually assumed. 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 in active galactic nuclei.
Laor Ari
Loeb Abraham
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