Instabilities in astrophysical jets. I - Linear analysis of body and surface waves

Details Instabilities in astrophysical jets. I - Linear analysis of body and surface waves Instabilities in astrophysical jets. I - Linear analysis of body and surface waves

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...387...69z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 1, 1992, p. 69-82. Research supported by University of New Mexic

Statistics

Computation

18

Active Galaxies, Galactic Clusters, Radio Jets (Astronomy), Roots Of Equations, Computational Astrophysics, Hydrodynamic Equations, Jet Flow, Shock Wave Propagation, Surface Waves

Scientific paper

The instabilities of astrophysical jets are investigated in a new and more generalized way than in previous studies. The dispersion equations for a thermal confined slab jet in a complex (k, omega) domain are solved. A number of singularities related to certain wave modes in this system are found. It is shown that the internal jet flow in the system is characterized by two internal sound waves, propagating against and with the flow, respectively. These two body waves grow in amplitude. The one propagating against the flow is condensed, which is crucial to disruption of jets. The other, propagating with the flow, is rarefied and less important in jet disruption. There are also a number of surface waves existing in the interface between the jet flow and the ambient medium. Two of them are identified to couple to their relevant acoustic body waves. They also grow in amplitude. It is suggested that the growing internal body waves and abundant growing surface waves can potentially explain many phenomena observed in astrophysical jets, such as quasi-periodic wiggles, jet disruption, limb-brightened features, and surface filaments.

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