Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255..100v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 100-104.
Astronomy and Astrophysics
Astrophysics
11
Faraday Effect, Interstellar Magnetic Fields, Magnetic Field Configurations, Spiral Galaxies, Dynamo Theory, Hydrogen, Star Formation
Scientific paper
The large scale magnetic field structures of spiral galaxies have been observed to consist of either the simple m(azim) = 0 axisymmetric azimuthal magnetic fields, or the simple m(azim)= 1 bisymmetric azimuthal magnetic fields, or has 'neither' field structure (considerable complexity, Beck 1991). Where should one look for the m(azim) = 2 mode? I show that the observations so far (m(azim) = 0 and M(H I) = large; m(azim) = 1 and M(H I) = average) suggest an empirical induction (m(azim) = 2 and M(H I) = small). Also, the theories so far (possible m(azim) mode being inversely proportional to the H I gas scale height) suggest a progressive elimination (m(azim) = 2 has never been predicted in galaxies with M(H I) = average or large). M(H I) is the neutral hydrogen mass. Here I predict that the m(azim) = 2 quadrupolar azimuthal magnetic field in a spiral galaxy (if detected) will be associated with a small neutral hydrogen gas mass M(H I). I also review the available data on star formation efficiency versus large-scale magnetic fields in galaxies. High values of the star formation efficiency cannot be used to predict accurately the large-scale magnetic fields.
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