Advection-dominated accretion: A self-similar solution

Abstract

view Abstract Citations (1929) References (13) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Advection-dominated Accretion: A Self-similar Solution Narayan, Ramesh ; Yi, Insu Abstract We consider viscous rotating accretion flows in which most of the viscously dissipated energy is stored as entropy rather than being radiated. Such advection-dominated flows may occur when the optical depth is either very small or very large. We obtain a family of self-similar solutions where the temperature of the accreting gas is nearly virial and the flow is quasi-spherical. The gas rotates at much less than the Keplerian angular velocity; therefore, the central stars in such flows will cease to spin up long before they reach the break-up limit. Further, the Bernoulli parameter is positive, implying that advection-dominated flows are susceptible to producing outflows. Convection is likely in many of these flows and, if present, will tend to enhance the above effects. We suggest that advection-dominated accretion may provide an explanation for the slow spin rates of accreting stars and the widespread occurrence of outflows and jets in accreting systems. Publication: The Astrophysical Journal Pub Date: June 1994 DOI: 10.1086/187381 arXiv: arXiv:astro-ph/9403052 Bibcode: 1994ApJ...428L..13N Keywords: Accretion Disks; Advection; Astronomical Models; Black Holes (Astronomy); Cooling Flows (Astrophysics); Stellar Mass Accretion; Viscous Flow; Hydrodynamics; Rotating Disks; Two Dimensional Flow; Astrophysics; ACCRETION; ACCRETION DISKS; BLACK HOLE PHYSICS; HYDRODYNAMICS; Astrophysics E-Print: 7 pages of text, 1 postscript figure, plain TeX, Harvard-Smithsonian Center for Astrophysics Preprint Series No. 3809 full text sources arXiv | ADS |