Physics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mim..proc..173k&link_type=abstract
The Magnetized Interstellar Medium, Proceedings of the conference, held in Antalya, Turkey, September 8 - 12, 2003, Eds: B. Uyan
Physics
9
Scientific paper
Large-scale regular magnetic fields with a spiral pattern exist in grand-design spirals, flocculent and even irregular galaxies. The regular field in spirals is aligned with the optical spiral arms but is usually strongest in the interarm regions, sometimes forming 'magnetic arms'. The strongest total field is found in the optical arms, but is mainly irregular. The large-scale regular field is best explained by some kind of dynamo action. Only a few galaxies show a dominant axisymmetric field pattern, most field structures seem to be a superposition of different dynamo modes or trace local effects related to density waves, bars or shocks. Observations of edge-on galaxies show that the regular magnetic fields are mainly parallel to the disk except in some galaxies with strong star formation and strong galactic winds as e.g. NGC 4631.
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