Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..210v&link_type=abstract
Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he
Astronomy and Astrophysics
Astrophysics
Scientific paper
Observations show that astrophysical jets are able to propagate over huge distances in comparison with their radial extents. This challenges theoretical and numerical studies, which predict a fast disruption of the jet by the development of internal magnetohydrodynamic instabilities. Particularly important is the Kelvin-Helmoltz instability, known to be the most dangerous for the jet's collimation. Here we use the modern finite-volume based MHD code, VAC, to reinvestigate the development of the Kelvin-Helmholtz instabilities by using high-resolution spatial simulations. We show that an initial large-scale disruption occurs after a propagation distance of a few tens of jet radius, in agreement with previous studies. In addition, we establish the existence of a new mechanism driven by the initial disruption of the jet. This mechanism gives rise to a local reinforcement of the magnetic field, which in turn leads to a new more stable configuration of the jet.
Baty Hubert
Viallet Marianne
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