Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196.1051f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 196, Sept. 1981, p. 1051-1066.
Astronomy and Astrophysics
Astrophysics
125
Boundary Layer Flow, Extragalactic Radio Sources, Kelvin-Helmholtz Instability, Magnetohydrodynamic Stability, Plasma Jets, Vortex Sheets, Astrophysics, Asymptotic Methods, Compressible Flow, Magnetic Fields, Pinch Effect, Subsonic Flow, Supersonic Flow, Transonic Flow
Scientific paper
Kelvin-Helmholtz instabilities in cylindrical boundary layer (jet) flows are considered, using the vortex-sheet approximation. Compressible flows are studied in subsonic, transonic, supersonic and relativistic regimes, and magnetic field effects are analyzed together with density contrast inside and outside the jet. It is generally found that because of the onset of a 'reflection' branch of resonant modes, jets are unstable both to pinching and helical perturbations with wavelengths of the order of the jet circumference. In particular, this is shown to play a part in the morphology and energetics of extended radio sources.
Ferrari Aldo
Trussoni Edoardo
Zaninetti Lorenzo
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