Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...314...33h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 314, March 1, 1987, p. 33-46. Research supported by Queen's University.
Astronomy and Astrophysics
Astronomy
13
Collimation, Eddy Viscosity, Galactic Structure, Radio Jets (Astronomy), Turbulent Flow, Astronomical Models, Galactic Nuclei, Hydrodynamics, Turbulence Effects, Viscous Flow
Scientific paper
In this paper it is assumed that the subscale turbulent eddies induced in an ambient medium by the emergence of a (already collimated) jet from a galactic nucleus (VLBI jet) are the source of the viscosity which causes material to be entrained into the large-scale (VLA) jet. New analytic solutions are derived by a generalization of the self-similar Ansatz used in the Landau-Squires solution to include variable density and viscosity. It is shown that such a process of 'viscous collimation' of the VLA jets can account for the observed collimation-luminosity correlation, the magnetic flux, and the inferred mass flux of these jets. Order of magnitude comparisons of velocity and density fields with recently observed emission-line flow regions near radio jets are made. All of the viscosity-dependent observational checks imply roughly the same plausible value for the eddy viscosity. It is emphasized that storing the initial VLBI jet energy in the intermediate scales occupied by the turbulent eddies allows this energy to be largely undetected.
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