Statistics – Computation
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...286...68b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 286, Nov. 1, 1984, p. 68-87.
Statistics
Computation
132
Astronomical Models, Brightness, Plasma Jets, Radio Galaxies, Surface Properties, Turbulent Jets, Compressible Flow, Computational Astrophysics, Flow Velocity, Interstellar Magnetic Fields, Mach Number, Shock Wave Propagation
Scientific paper
It is proposed that radio jets "turn on" as a result of shocks induced by their becoming underexpanded a few seconds of arc from the core. A sequence of shocks and/or turbulent entrainment causes some jets to decelerate to a Mach number near unity and to spread laterally at a rate comparable to that of laboratory jets. A model is developed to infer the velocity and surface brightness of the jet in this region. The analysis makes extensive use of Favre's (1969) statistical mass-averaging technique for compressible turbulent flow and the existing experimental and theoretical literature on laboratory jets. This model is used to describe the surface brightness of the 3C 31 jet and to study the physical state of the interstellar medium in the optical counterpart NGC 383.
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