Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...422..508k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 422, no. 2, p. 508-520
Astronomy and Astrophysics
Astronomy
39
Active Galactic Nuclei, Active Galaxies, Astronomical Models, Black Holes (Astronomy), Gas Streams, Hydrodynamics, Mathematical Models, Deposition, Gas Dynamics, Precession, Stellar Orbits, Stellar Structure
Scientific paper
We study the hydrodynamcis of the gas stream created from the debris of a star disrupted by the tides of a massive black hole. The circularization and accretion of the debris orbits depends on the transverse structure of the stream because the stream cross section determines the effectiveness of energy and angular momentum transfers. The transverse structure is modified by crossing points in the stream where orbits are focused across the stream center or through the orbital plane, the velocity shear across the stream, self-gravity (in the more distant encounters), recombination, shocks, and shear viscosity. During the first several orbits it is insensitive to the ambient medium and the luminosity of the active galactic nucleus. Stream-stream collisions may have a weak effect on the orbits because of Lense-Thirring precession, mismatched geometric cross sections, and the kinematics of collisions.
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