Kelvin-Helmholtz instabilities in radio jets

Details Kelvin-Helmholtz instabilities in radio jets Kelvin-Helmholtz instabilities in radio jets

Jul 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..195r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 196, July 1981, p. 195-207.

Astronomy and Astrophysics

Astronomy

90

Astronomical Models, Kelvin-Helmholtz Instability, Plasma-Electromagnetic Interaction, Radio Galaxies, Radio Jets (Astronomy), Vortices, Compressibility, Galactic Radiation, Interstellar Magnetic Fields, Plasma Frequencies, Plasma Oscillations, Plasma Pinch, Tearing Modes (Plasmas)

Scientific paper

Models in which the lobes of radio galaxies are powered by continuous beams from the parent optical galaxy are considered. There are several pieces of evidence that energy is supplied to the outer lobes by beams. There are also cases in which jets link hot spots to the parent galaxy. Small-scale nuclear jets have also been found. These jets could delineate the path of the beams. A key question concerns the possibly serious effects of Kelvin-Helmholtz instabilities occurring in the vortex sheet between the beam and the external medium. The considered investigation is concerned with the growth of Kelvin-Helmholtz instabilities on the vortex sheet of a cylindrical jet, both with and without an axial magnetic field. Only wavelengths greater than or approximately equal to the jet circumference are considered, as these are the only ones likely to disrupt the beam. A dispersion relationship is derived for the case of a jet, which may be relativistic, containing an axial magnetic field. It is shown that magnetic fields can be instrumental in stabilizing beams of moderate to large Mach number.

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