Supercritical Accretion Disks with Superwinds

Details Supercritical Accretion Disks with Superwinds Supercritical Accretion Disks with Superwinds

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54..235k&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.54, No.2, pp.235-240

Astronomy and Astrophysics

Astronomy

12

Accretion, Accretion Disks, Black Holes, Supercritical Accretion, Supersoft X-Ray Sources, X-Rays: Individual (Cal 83, Cal 87, Smc 13, Rxj0019.8+2156)

Scientific paper

We construct a model for supercritical accretion disks with winds, where the mass-accretion rate highly exceeds the Eddington rate and a significant fraction of the accreting gas is expelled as a superwind, under a self-similar treatment. The mass-accretion rate dot{M} decreases with radius r as dot{M} ∝ rs+1/2, where s (>= -1/2) is some arbitrary constant. The surface density Σ and the disk central temperature Tc vary as Σ ∝ rs and Tc ∝ rs/4-1/2, Tc ∝ rs/4-1/2, respectively. In spite of such a modification, we found that the scaleheight H and the surface temperature T of such a superdisk with a superwind is very similar to those of a superdisk without winds; H ∝ r and T ∝ r-1/2 T ∝ r-1/2. Furthe rmore, the optical depth of the wind becomes remarkably smaller than that in the spherical case, because mass loss takes place at various radii on the disk, and the gas distribution in the wind is not concentrated, but diluted in space. Hence, the observational appearances of both superdisks are quite similar, except for the existence of a strong wind, unless the wind mass-loss rate highly exceeds the critical rate. We then apply a superdisk with a superwind to supersoft X-ray sources. In our picture, although the accretion rate in these objects is of the order of 10-5 Msolar yr-1 at the outer edge of the disk and a sufficiently thick superdisk may be established, most of the gas is expelled by the superwind, and the accretion rate at the center becomes of the order of 10-7 - 10-6 Msolar yr-1.

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