Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..591v&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 292, p. 591
Mathematics
Logic
11
Stellar Mass Ejection, Magnetohydrodynamic Stability, Plasma Jets, Magnetohydrodynamic Flow, Analytic Functions, Asymptotic Methods, Collimation, Cylindrical Plasmas
Scientific paper
General theoretical arguments and various analytic self-similar solutions have recently shown that magnetized and rotating astrophysical outflows may become asymptotically cylindrical, in agreement with observations of cosmical jets. A notable common feature in all such self-consistent, self-similar MHD solutions is that before final cylindrical collimation is achieved, the jet passes from a stage of oscillations in its radius, Mach number and other physical parameters. It is shown that under rather general assumptions this oscillatory behavior of collimated outflows is not restricted to the few specific models examined so far, but instead seems to be a rather general physical property of an MHD outflow that starts noncylindrically before it reaches collimation. It is concluded that astrophysical jets are topologically stable to small-amplitude, time-independent perturbations in their asymptotically cylindrical shape. These oscillations may give rise to brightness enhancements along jets.
Tsinganos Kanaris
Vlahakis Nektarios
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