Kelvin-Helmholtz Instability of Jets With Radial Structure

Details Kelvin-Helmholtz Instability of Jets With Radial Structure Kelvin-Helmholtz Instability of Jets With Radial Structure

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.402h&link_type=abstract

Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:

Astronomy and Astrophysics

Astrophysics

Scientific paper

We further investigate the Kelvin-Helmholtz instability of jets made of several co-axial components, basically an innner beam surrounded by an envelope, propagating in an external medium. We find evidence for two main types of instability modes, with mode crossing and interaction between modes. These two modes correspond to the excitation of sound waves in the beam and in the envelope which can both act as a resonant waveguide. As a result, we show that the addition of an inner beam inside a jet can strongly enhance the linear growth of its Kelvin-Helmholtz instability. Such scenario appears quite relevant to give account for the complex morphology and velocity fields now observed in a few jets as in M87, where various layers with respect to the jet axis are clearly visible.

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