Physics – Plasma Physics
Scientific paper
Nov 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aps..dppfm1003l&link_type=abstract
American Physical Society, 46th Annual Meeting of the Division of Plasma Physics, 15-19 November, 2004, Savannah, GA. MEETING I
Physics
Plasma Physics
Scientific paper
Magnetic fields are known to play an important role in determining the overall structures of astrophysical jets, especially in extra-galactic jets powered by supermassive black holes at centers of galaxies. Many questions remain regarding such objects, one of which is the mechanism(s) for collimation. This is a particularly difficult, multi-scale problem since it involves the evolution of magnetic fields driven by the black-hole accretion disk engine, followed by the propagation through the galaxy and expansion into the general inter-galactic medium. We will present 3D MHD simulations (both ideal and resistive) of the formation of large scale magnetic jets/``towers'', evolved from an idealized initial state where the ``engine'' is modeled as a highly wound and compressed magnetic ``spring''. We will present a detailed analysis of the structure of the ``tower'', instabilities present, and mechanisms for collimation and flux conversion. We will also compare our simulation results with astrophysical jet observations.
Finn John
Lapenta Gianni
Li Hui
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