Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392...54l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 54-64.
Astronomy and Astrophysics
Astronomy
35
Computerized Simulation, Extragalactic Radio Sources, Magnetohydrodynamic Flow, Radio Jets (Astronomy), Bow Waves, Galaxies, Hypersonic Flow, Pressure Distribution, Quasars
Scientific paper
Results of a high-resolution hydrodynamical simulation of an extremely supersonic jet with a Mach number of 4650 are presented. Both the Mach number and the final length of the jet are greater than those of any previously published simulation. The hypersonic jet is found to be highly dynamic in nature with varying head velocity and shape; the importance of the back action of the cocoon upon the jet is also clearly seen. Such hypersonically moving jets account for the observations of luminous extragalactic radio jets, associated with classical double radio sources, which appear to be overpressured with respect to the surrounding ambient medium. In the present model the jet remains well collimated, while the region behind the bow shock is overpressured by a factor of about 1600 with respect to the quiescent ambient medium, thus establishing the validity of the ram-pressure confinement scheme. New VLA data are used to constrain the physical parameters of 3C 208 within the confines of this simulation.
Burns O. Jr. J.
Clarke David A.
Loken Chris
Norman Michael L.
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