Computer Science – Sound
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.184...53b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 184, July 1978, p. 53-67.
Computer Science
Sound
112
Black Holes (Astronomy), Radiation Pressure, Sound Waves, Stellar Envelopes, Stellar Mass Accretion, Thermodynamic Equilibrium, Eddington Approximation, Gas Pressure, Gas Temperature, Interstellar Gas
Scientific paper
The steady flow of a uniform nonrelativistic gas, in which radiation pressure swamps thermal pressure at infinity, is studied in terms of the dynamics of an in-falling gas into a black hole. It is shown that the actual accretion rate depends on the optical depth of a column of unperturbed gas spanning the Bondi radius. Radiation leaks out of the gas as it moves toward the trans-sonic point, and the sound speed decreases inwards in the subsonic region. Thus, the density must increase sharply to maintain pressure. It is suggested that if a super-massive (500,000 solar masses) star is swallowed by a black hole, it will not have time to ignite its nuclear fuel and blow itself apart, and will add substantially to the mass of the hole.
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