Bisymmetric Spiral Magnetic Fields and Gravitational Instabilities of Galactic Disks [chapter]

T. Sawa, M. Fujimoto
1990 Galactic and Intergalactic Magnetic Fields  
Linearized equations of motion are solved for the self-gravitating gaseous disk in interaction with the Lorentz force due to the bisymmetric spiral (BSS) magnetic fields. Since the pattern velocity of the BSS fields is very close to that of the spiral density wave, a nearly-resonant interaction occurs between these two waves to enhance spiral condensation of gas. The BSS fields seem to compensate the spiral density waves for their secular dispersion.
doi:10.1007/978-94-009-0569-6_36 fatcat:omefjfauvzdvfmaxlozmcmehae