Statistics – Computation
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005mpge.conf...74d&link_type=abstract
The Magnetized Plasma in Galaxy Evolution, Proceedings of the conference held in Kraków, Poland, Sept. 27th - Oct. 1st, 2004, Ed
Statistics
Computation
2
Scientific paper
The nonlinear evolution of magneto-rotational instability (MRI) is investigated in the galactic disks. The model includes differential rotation, vertical density stratification, no self-gravitation. The full set of MHD equations is solved, using 3D ZeusMP code. The global simulations are presented for the cylindrical computational box where both rigid and flat parts of rotation curve are included. Calculations show that the MRI-driven turbulence first appear in the inner part of a sheared disk and slowly propagates outwards. The growth rate is shown to depend on the shear rate. We justify the idea of explaining the observed dispersion velocity value (common for many galaxies ) with the MRI action in sheared outer disk (Sellwood & Balbus 1999), obtaining the velocity dispersion ˜ 5 km/s. The radial dependence of growth rates, velocity dispersion and magnetic pitch angles in the galaxy are demonstrated.
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