Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.202..935a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 202, Mar. 1983, p. 935-949.
Astronomy and Astrophysics
Astronomy
5
Astronomical Models, Kelvin-Helmholtz Instability, Radio Sources (Astronomy), Taylor Instability, Beam Interactions, Compressible Fluids, Incompressible Fluids, Intergalactic Media, Mathematical Models, Supersonic Flow
Scientific paper
Rayleigh-Taylor, Kelvin-Helmholtz and drift-wave instabilities are studied in the context of the heads of unsteady-beam models of extended radio sources, and the physical consequences of this preliminary analysis are discussed. It is shown that the Rayleigh-Taylor instability sets in on small scales, although complete mixing of the head and ambient materials might not occur. Thus tails may be knotty or have a shell structure (depending upon the nature of the unsteadiness of the beam) whilst hotspots are unlikely to contain any entrained intergalactic material. It is argued that Kelvin-Helmholtz and drift-wave instabilities tend to be suppressed by field shear and density gradients in the interface between the shocked beam and shocked intergalactic flows.
Allen Anthony J.
Hughes Philip A.
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