X-radiation limited accretion flow. I - Steady flow regime

Details X-radiation limited accretion flow. I - Steady flow regime X-radiation limited accretion flow. I - Steady flow regime

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..755s&link_type=abstract

Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 755-767.

Astronomy and Astrophysics

Astronomy

14

Stellar Mass Accretion, X Ray Sources, Black Holes (Astronomy), Bremsstrahlung, Compton Effect, Flow Equations, Mass Flow, Neutron Stars, Steady Flow, Stellar Luminosity

Scientific paper

Solutions to the problem of spherically symmetric and optically thin, X-ray heated accretion flow, obtained by relaxation techniques, show that heating effects can reduce the mass flux in luminous models with X-ray production efficiencies exceeding 0.003 X (10 keV/epsilon(max)). The flow disrupts only when supercritical, implying (1) a luminosity limit for steady flow, and (2) that flows exceeding this limit will flare on time scales from seconds to months (X mass/solar mass), with shorter periods at higher luminosities. Models near this limit show stable, steady flow with a slight shell structure, and are found to have an alternate flaring mode if perturbed strongly enough. Models with efficiencies lower than 0.003 X (10 keV/epsilon(max)) are not heated in the optically thin region, but may disrupt near the Schwartzschild radius if the accreting object is a black hole whose L/L(E) ratio is greater than its mass flux reduction efficiency.

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