Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996pasj...48..631f&link_type=abstract
Publications of the Astronomical Society of Japan, v.48, p.631-638.
Astronomy and Astrophysics
Astronomy
16
Accretion Disks, Astrophysical Jets, Black Holes, Radiation Processes, Stars: Winds
Scientific paper
We examine the steady relativistic winds which are emanating from a luminous accretion disk and driven by disk radiation fields under the influence of radiation drag. For wind flows we use a streamline approach where the dynamical equations are expressed by the streamline coordinates, and a cold approximation where the pressure-gradient force is ignored. For radiation fields, on the other hand, we use a near-disk approximation where the radiation stress-energy tensors are evaluated from the disk region just below the flows. The streamlines may widen, since the wind flows gain angular momentum from the disk radiation field just below them. The wind terminal speed is smaller than the Icke's magic speed of (4-sqrt {7})c/3 ~ 0.45c, because the streamlines are generally inclined, and therefore the radiative force is smaller than in the case of vertical streamlines. The conditions that the radiative wind blows are obtained for the control parameters: the radius of the wind base and the normalized disk luminosity. The radiative wind can blow from the inner region (r_0 ~ 5--8 r_g) if the disk is sufficiently luminous. %A collimation effect of winds by radiation drag, %which is found in the previous work (Tajima and Fukue 1995), %is also confirmed. %Configuration instability of streamlines is found. We also briefly discuss pure electron-positron pair winds, where the acceleration takes place very close to the disk.
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