Helical and pinching instability of supersonic expanding jets in extragalactic radio sources

Details Helical and pinching instability of supersonic expanding jets in extragalactic radio sources Helical and pinching instability of supersonic expanding jets in extragalactic radio sources

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..509h&link_type=abstract

Astrophysical Journal, Part 1, vol. 257, June 15, 1982, p. 509-526. Research supported by the University of Alabama.

Astronomy and Astrophysics

Astrophysics

53

Extragalactic Radio Sources, Galactic Nuclei, Helical Flow, Kelvin-Helmholtz Instability, Pinch Effect, Supersonic Jet Flow, Compressible Fluids, Gas Expansion, Mach Number, Perturbation Theory, Propagation Modes, Radio Galaxies, Wave Dispersion

Scientific paper

The jets that are observed in extragalactic radio sources expand as distance from the nucleus increases. This can be interpreted as a jet expanding to remain in pressure balance with the interstellar and intergalactic medium. The structure of radio sources may be determined by the stability properties of jets. In this paper we consider the stability properties of an expanding jet. We find that an expanding jet, like a jet of constant radius, is unstable to Kelvin-Helmholtz perturbations. On an expanding jet, wavelengths increase and growth rates decrease proportional to the jet radius. The practical result is that wave amplitudes increase linearly rather than exponentially along the jet. The long-wavelength perturbations which can affect the structure in observable fashion can be stabilized by convection along the expanding jet. This will allow jets to propagate farther than has been previously thought for reasonable values of jet velocity, density, and Mach number. If a jet appears distorted by a pinching or a helical wave, then jet Mach number and density relative to the external medium can be estimated from observation of the wavelength.

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