Triggering the bisymmetric (m = 1) magnetic fields in spiral galaxies

Details Triggering the bisymmetric (m = 1) magnetic fields in spiral galaxies Triggering the bisymmetric (m = 1) magnetic fields in spiral galaxies

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...361..419v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 361, Oct. 1, 1990, p. 419-425.

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10

Interstellar Magnetic Fields, Polarimetry, Spiral Galaxies, Dynamo Theory, Galactic Structure, Interstellar Matter

Scientific paper

In this paper, a search is carried out to find the observational parameters whose values can be used to predict the global magnetic field shape (m = 0 or m = 1). Using data for six spiral galaxies with a definitely known magnetism and six other spiral galaxies with the best estimates of their magnetism, it is shown that the three spiral galaxies with H I gas masses in excess of 8.5 x 10 to the 9th solar masses have an axisymmetric (m = 0) magnetic field, while all nine spiral galaxies whose H I gass masses are smaller than this value have a bisymmetric (m = 1) magnetic field or a more complex one. These results confirm the relation first detected by Vallee (1986) between the H I gas mass and the magnetic field shape.

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