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- W1570598418 abstract "Spherically symmetric non-steady accretion via external radiation drag in the optically thin regime is investigated using self-similar transformations in the gravitational potential by a point-mass M. We assume that the external drag force is proportional to the velocity vector v as -(3v, where (3 is spatially constant and is a function of time. In a regime where the effect of gas pressure is not taken into account, we find self-similar solutions which connect the asymptotic solutions such that v = J2GM/r, p ex r-3 / 2t near to the center and v ex -GMt/r2 , p = const. far from the center. The freefall region spreads with time as rt ex t2/ 3 . The gas is assumed to be at rest and the density is constant far from the center. It is found that: (1) the drag slows an infalling velocity far from the center, (2) the drag flattens the density distribution near to the center, and (3) the drag decreases the mass-accretion rate. Selecting the radiation drag parameter in order for the ionization degree to be 0(1) at an epoch z =400-200, it is found that this radiation drag reduces the mass accretion rate by a factor of 2. Such spherical accretion via an external radiation drag proportional to the velocities may be realized when the systems are embedded in radiation fields. The present self-similar solution may be applicable for gas accretion into a point-mass potential, which is, for instance, produced by a massive black hole formed during an early epoch." @default.
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- W1570598418 date "1995-02-25" @default.
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- W1570598418 title "Self-Similar Spherical Accretion via External Radiation Drag" @default.
- W1570598418 hasPublicationYear "1995" @default.
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