Anomalous persistence of bisymmetric magnetic structures in spiral galaxies

Details Anomalous persistence of bisymmetric magnetic structures in spiral galaxies Anomalous persistence of bisymmetric magnetic structures in spiral galaxies

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292....1b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 292, p. 1

Astronomy and Astrophysics

Astronomy

12

Interstellar Magnetic Fields, Spiral Galaxies, Galactic Structure, Magnetic Field Configurations, Astronomical Models, Dynamo Theory

Scientific paper

We discuss the nonlinear evolution of a self-excited bisymmetric magnetic field in a galactic disk with spiral arms. We assume that the level at which the dynamo saturates is modulated by the spiral pattern. Using asymptotic estimates and two-dimensional numerical simulations, we show that a bisymmetric magnetic field can have a lifetime in excess of 10-15 Gyr in a region around the corotation radius whose radial extent is a few kiloparsecs. The field is trapped by the spiral arms, i.e., it rotates rigidly together with the spiral pattern. Our numerical model roughly resembles the galaxy M51, and our results show a promising degree of agreement with the magnetic pattern observed in this galaxy.

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