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Super-Eddington Black-Hole Models for SS 433
Author(s) -
Tôru Okuda
Publication year - 2002
Publication title -
publications of the astronomical society of japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.99
H-Index - 110
eISSN - 2053-051X
pISSN - 0004-6264
DOI - 10.1093/pasj/54.2.253
Subject(s) - physics , astrophysics , accretion (finance) , thin disk , funnel , eddington luminosity , active galactic nucleus , stars , galaxy , chemistry , organic chemistry
We examine highly super-Eddington black-hole models for SS 433, based ontwo-dimensional hydrodynamical calculations coupled with radiation transport.The super-Eddington accretion flow with a small viscosity parameter, $\alpha = 10^{-3}$, results in a geometrically and optically thick disk witha large opening angle of $\sim 60^{\circ}$ to the equatorial plane and a veryrarefied, hot, and optically thin high-velocity jets region around the disk. The thick accretion flow consists of two different zones: an inneradvection-dominated zone and an outer convection-dominated zone. Thehigh-velocity region around the disk is divided into two characteristicregions, a very rarefied funnel region along the rotational axis and amoderately rarefied high-velocity region outside of the disk. The temperaturesof $\sim 10^7$ K and the densities of $\sim 10^{-7}$ g cm$^{-3}$ in the upperdisk vary sharply to $\sim 10^8$ K and $10^{-8}$ g cm$^{-3}$, respectively,across the disk boundary between the disk and the high-velocity region. TheX-ray emission of iron lines would be generated only in a confined regionbetween the funnel wall and the photospheric disk boundary, where flows areaccelerated to relativistic velocities of $\sim$ 0.2 $c$ due to the dominantradiation-pressure force. The results are discussed regarding the collimationangle of the jets, the large mass-outflow rate obserevd in SS 433, and theADAFs and the CDAFs models.Comment: 19 pages, 11 figures, to be published in Publ. Astron. Soc. Japan, 200

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