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Swing Excitation of Galactic Magnetic Fields Induced by Spiral Density Waves

  • Masashi Chiba (a1) and Makoto Tosa (a1)

Abstract

The generation and maintenance of galactic magnetic fields are considered when the dynamo-acted disk is perturbed by spiral density waves. The periodic change of gaseous density and shear is coupled with the field oscillation as a dynamo wave. We find the conditions for parametric resonance which increases the efficiency of dynamos. Special attention is paid to two-armed spiral galaxies, in which the BSS field structure is possibly the most effectively excited configuration owing to the present mechanism.

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Copyright

References

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Binney, J. & Tremaine, S. (1987). Galactic Dynamics , Princeton University Press, Princeton.
Landau, L.D. & Lifshitz, E.M. (1969). Mechanics , 2nd ed., Pergamon Press, Oxford.

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