Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371..289k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 371, April 10, 1991, p. 289-295. University of California-supported researc
Astronomy and Astrophysics
Astronomy
7
Extragalactic Radio Sources, Magnetic Field Configurations, Magnetohydrodynamic Flow, Radio Jets (Astronomy), Supernova Remnants, Toroidal Plasmas, Radial Velocity, Very Large Array (Vla), Very Long Base Interferometry
Scientific paper
The toroidal magnetic fields embedded in a precessing jet exert a radial force which can overcome the transverse expansion and focus the jet. The focusing occurs only if the jet is in pressure equilibrium with the ambient medium - a freely expanding jet does not focus. In a medium with a nearly constant ambient pressure such as the interior of a SNR or wind cavity, the focal length defined by the distance along the symmetry axis at which the radial velocity reverses is a combination of the distance required to bring the jet into pressure equilibrium with the medium and the distance required to focus the jet. If the Alfven Mach number of the radial velocity is supersonic when the jet achieves pressure equilibrium with the ambient medium (as is the case in SS 433), the focal length is related to the initial magnetic pressure of the toroidal field in the jet, the ambient pressure, the internal Alven Mach number of the radial expansion of the precession cone, and the initial position.
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