Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995nyasa.773...14h&link_type=abstract
Waves in Astrophysics, vol. Volume 773, p. 14-31
Astronomy and Astrophysics
Astrophysics
2
Magnetohydrodynamic Waves, Extragalactic Radio Sources, Kelvin-Helmholtz Instability, Galactic Winds, Space Plasmas, Magnetohydrodynamic Stability, Synchrotron Radiation, Jet Flow, Three Dimensional Flow, Two Dimensional Flow
Scientific paper
Extragalactic radio sources are observed to be produced by highly collimated outflows from the centers of galaxies and quasars. More locally, highly collimated outflows are observed to be associated with protostellar systems (e.g., HH34). Such highly collimated outflows are subject to the Kelvin-Helmholtz instability. Observation of extragalactic jets provide examples where highly collimated jets propagate tens of times their diameter before bending or flaring (e.g., NGC6251), or develop sinusoidal bending after only a short distance (e.g., 3C449). It is hoped that observed jet structures can be related to jet velocity, density, and magnetic fields via stability theory and modeling. This is of particular importance to extragalactic jets where the continuum nature of synchrotron emission provides no direct measure of these quantities. In this paper we study the magnetohydrodynamic (MHD) waves driven unstable by the highly collimated jet flow, study the instability properties of two- and three-dimensional flows, and compare the predicted results to several numerical simulations.
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