Can a spherically accreting black hole radiate very near the Eddington limit

Details Can a spherically accreting black hole radiate very near the Eddington limit Can a spherically accreting black hole radiate very near the Eddington limit

Apr 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mnras.187..237b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 187, Apr. 1979, p. 237-251.

Astronomy and Astrophysics

Astronomy

75

Black Holes (Astronomy), Radiative Transfer, Stellar Mass Accretion, Supercritical Flow, Dissipation, Flow Distribution, Radiation Pressure, Radiation Sources, Spheres, Thomson Scattering

Scientific paper

Some aspects of radiative transfer through a supercritical spherically symmetric accretion flow onto a black hole are discussed, and it is concluded that the diffusive luminosity at infinity cannot exceed 0.6 times the Eddington limit for a gas of Thomson scatterers (LE). All of the emergent radiation is produced by the gas during infall from energy originally supplied by the gravitational field. When the gas has fallen far enough for its emissivity to approach LE, it is on the verge of crossing the 'trapping radius' for radiation, and much of the radiation is dragged into the hole. On the basis of this result, it is argued that radiation pressure from a spherically accreting black hole cannot prevent the accretion rate from attaining arbitrarily high values, even if 'photon bubbles' transport much of the radiation. The possible astrophysical relevance of supercritically accreting black holes and the possible appearance of such a black hole to an observer are discussed.

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