Cosmological Accretion Disk Embedded in Background Radiation: Interplay of Viscosity and Radiation Drag

Details Cosmological Accretion Disk Embedded in Background Radiation: Interplay of Viscosity and Radiation Drag Cosmological Accretion Disk Embedded in Background Radiation: Interplay of Viscosity and Radiation Drag

Apr 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasj...50..233m&link_type=abstract

Publications of the Astronomical Society of Japan, v.50, p.233-240.

Astronomy and Astrophysics

Astronomy

6

Accretion, Accretion Disks, Black Holes, Cosmology, Galaxies: Nuclei, Radiation Drag

Scientific paper

The time-evolutionary properties of a standard alpha -type disk under the influence of a strong radiation field (``beta drag'') is investigated. Viscous diffusion tends to transport angular momentum from the inner portions outward, whereas Compton drag efficiently removes angular momentum at large radii. As a result, both effects reinforce each other, promoting a more rapid accretion, compared with those cases in the absence of either of the two processes. The effects of radiation drag can be understood by simple transformations of the radius and time; if the kinematic viscosity varies as nu ~ r(a) with a being a constant, and if the angular frequency is Omega ~ r(-3/2) , for example, the surface density evolves as Sigma (r,t) = e({4beta ) t} f(r',t') with r' equiv r e({2beta ) t} and t'equiv (e({nbeta ) t}-1)/(nbeta ), where f(r,t) is the Sigma evolution without radiation drag, beta is the reciprocal of the drag timescale, and n=4-2a. As a consequence, the disk is exponentially contracting with time.

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