Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999dda....31.0802n&link_type=abstract
American Astronomical Society, DDA meeting #31, #08.02
Astronomy and Astrophysics
Astrophysics
Scientific paper
Last year, Kouveliotou et al. (1998) discovered a new class of short-lived old stellar objects known as magnetars. When a massive star undergoes the catastrophic collapse which precedes a supernova explosion, it undergoes a very rapid spin-up causing its attached dipolar magnetic field lines to become very tightly wound in a toroidal configuration achieving strengths of 10(15) Gauss or more. The corresponding Larmor radius is very small in contrast with the collisional mean free path, and a magnetically-driven collisionless shock of a beta =0 plasma (i.e., magnetic pressure much stronger than the thermal pressure) proceeds into the surrounding interstellar medium. In this paper, we explore the dynamical evolution of this magnetically-driven shock and its scaling properties. In addition, we explore the transition from an MHD-driven shock to a gas dynamical shock (the Sedov solution), as Ohmic dissipation ultimately converts the energy contained in the magnetic field into thermal energy.
Newman Alice L.
Newman William I.
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