Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986cajph..64..403h&link_type=abstract
(Conference on Jets from Stars and Galaxies, Toronto, Canada, June 24-27, 1985) Canadian Journal of Physics (ISSN 0008-4204), vo
Astronomy and Astrophysics
Astronomy
1
Compressible Fluids, Radio Jets (Astronomy), Turbulent Jets, Viscous Flow, Active Galactic Nuclei, Flow Equations, Pressure Gradients, Radio Galaxies, Stellar Mass Ejection, Very Large Array (Vla)
Scientific paper
This paper reports a number of new results for self-similar jet flows based on the idea of extending the self-similarity to include the turbulent viscosity coefficients. The first result distinguishes between flows that are luminosity preserving and those that are momentum preserving with distance from the central source. The luminosity-preserving flows can induce pressure gradients that increase the momentum flux with distance. This can explain the apparent excess of momentum in the bipolar outflows from stars and in the very large array radio-galaxy jets over their corresponding small-scale structures. The medium must evidently be sufficiently absorptive of the central luminosity at some stage of the outflow. In addition, two new analytical jet solutions are described. One demonstrates the self-confinement of a viscous jet even in a medium of declining pressure for a sufficiently strong jet. The other solution demonstrates a jet flow in a globally closed circulation pattern. This might be of use in discussing the line motions in active galactic nuclei.
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