Spherical accretion onto quasars

Details Spherical accretion onto quasars Spherical accretion onto quasars

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...267...18k&link_type=abstract

Astrophysical Journal, Part 1, vol. 267, Apr. 1, 1983, p. 18-30.

Astronomy and Astrophysics

Astronomy

44

Galactic Nuclei, Gas Flow, Quasars, Single-Phase Flow, Steady Flow, Thermal Instability, Astronomical Models, Black Holes (Astronomy), Eddington Approximation, Flow Stability, Gas Temperature, Seyfert Galaxies

Scientific paper

The problem of time-steady accretion of gas irradiated by a self-consistently generated quasar-like continuum is investigated. A controversy in the literature is resolved by a careful distinction between the existence of solutions and their stability. Specific criteria are found for when thermal instabilities may disrupt single-phase steady flow. As a function of initial temperature (1,000,000-100,000,000 K), the boundaries of stable flow in the luminosity are determined relative to the Eddington (L/LE)-efficiency plane. The thermal and dynamical history of these steady flows is analyzed. The observational data that define quasars and type I Seyfert galaxies are matched to find values of efficiency and L/LE required for consistent spherically symmetric steady-flow models. The efficiency is constrained to be less than 1/100, and L/LE resides between several times 1/1000-1/100.

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