Time-dependent spherically symmetric accretion onto compact X-ray sources

Details Time-dependent spherically symmetric accretion onto compact X-ray sources Time-dependent spherically symmetric accretion onto compact X-ray sources

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226.1041c&link_type=abstract

Astrophysical Journal, Part 1, vol. 226, Dec. 15, 1978, p. 1041-1062.

Astronomy and Astrophysics

Astronomy

98

Gas Flow, Gas Heating, Stellar Luminosity, Stellar Mass Accretion, Stellar Models, X Ray Sources, Active Galactic Nuclei, Binary Stars, Black Holes (Astronomy), Bremsstrahlung, Flare Stars, Flow Stability, Flow Velocity, Neutron Stars, Numerical Integration, Time Dependence

Scientific paper

Analytical arguments and a numerical hydrodynamic code are used to investigate spherically symmetric accretion onto a compact object, in an attempt to provide some insight into gas flows heated by an outgoing X-ray flux. It is shown that preheating of spherically symmetric accretion flows by energetic radiation from an X-ray source results in time-dependent behavior for a much wider range of source parameters than was determined previously and that there are two distinct types of instability. The results are compared with observations of X-ray bursters and transients as well as with theories on quasars and active galactic nuclei that involve quasi-spherically symmetric accretion onto massive black holes. Models based on spherically symmetric accretion are found to be inconsistent with observations of bursters and transients.

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