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Nonlinear Interaction Between Magnetic Fields and Spiral Arms

  • M. Chiba (a1)

Abstract

The evolution of galactic magnetic fields under the influence of spiral arms is investigated numerically by 2-dimensional simulation. We compute several models, especially when the swing-excitation mechanism works. We consider also the modification of the mean velocity fields driven by the Lorentz force of the growing magnetic fields. The characteristic structure of magnetic fields around the arm in each model is compared with the observations.

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Tubbs, A.D. 1980, Ap. J. , 239, 882.

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