Abstract
view Abstract Citations (54) References (20) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Spherical accretion onto quasars Krolik, J. H. ; London, R. A. Abstract 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. Publication: The Astrophysical Journal Pub Date: April 1983 DOI: 10.1086/160841 Bibcode: 1983ApJ...267...18K Keywords: 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; Astrophysics full text sources ADS |
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