Magnetohydrodynamic Simulations of the Wiggle Instability in Spiral Galaxies

Details Magnetohydrodynamic Simulations of the Wiggle Instability in Spiral Galaxies Magnetohydrodynamic Simulations of the Wiggle Instability in Spiral Galaxies

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..784..792t&link_type=abstract

MAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures. AIP Conference Proceedings, Volume 784, pp

Physics

1

Magnetohydrodynamics, Galaxies, Magnetohydrodynamics And Plasmas, Spiral Galaxies

Scientific paper

We studied the stability of galactic spiral shocks through two dimensional global magnetohydrodynamic simulations. Recently, Wada & Koda (2003) showed, using global hydrodynamic simulations, that galactic gas flows behind a spiral shock becomes unstable against a perturbation parallel to the shock front and form spur-like density structures. They attributed the origin of this wiggle instability to the Kelvin-Helmholtz (K-H) instability triggered by the acceleration of the gas behind the shock. We carried out global simulations including galactic magnetic fields. The initial magnetic field is assumed to be either uniform or purely toroidal. We found that although the magnetic field reduces the growth rate of the K-H instability, wiggle instability develops even in galaxies with μG magnetic fields. We also present the results of local simulations to demonstrate the dependence of the growth rate of the instability with the wavelength. The interval of spurs is determined by the most unstable wavelength of the wiggle instability.

Affiliated with

Also associated with

No associations

Rating

Magnetohydrodynamic Simulations of the Wiggle Instability in Spiral Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Magnetohydrodynamic Simulations of the Wiggle Instability in Spiral Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetohydrodynamic Simulations of the Wiggle Instability in Spiral Galaxies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1300754