Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...125..179f&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 125, no. 2, Sept. 1983, p. 179-186. Research supported by the Fondazione Angel
Astronomy and Astrophysics
Astronomy
29
Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Parameter Identification, Radio Galaxies, Radio Jets (Astronomy), Astronomical Models, Plasma Oscillations, Supersonic Flow
Scientific paper
In this paper the interpretation of large scale, small amplitude morphologies in jets (the so-called wiggles and knots) in terms of MHD Kelvin-Helmholtz instability in cylindrical supersonic flows is discussed. Theoretical growth rates and perturbation wavelengths are compared with observations of a VLA sample of well analyzed jets. This model makes it possible to estimate the physical parameters of the jet plasma, i.e., flow's Mach number, density, temperature, and provides definite predictions, which will be possibly tested in future observations. Limits and approximations of the model are indicated, but they do not seem to affect critically the obtained conclusions.
Ferrari Aldo
Trussoni Edoardo
Zaninetti Lorenzo
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