Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...177...27b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 177, no. 1-2, May 1987, p. 27-41.
Astronomy and Astrophysics
Astrophysics
65
Dynamo Theory, Interstellar Magnetic Fields, Spiral Galaxies, Andromeda Galaxy, Asymptotic Methods, Galactic Rotation, Magnetohydrodynamics, Milky Way Galaxy, Solar Neighborhood
Scientific paper
The authors discuss the origin of bisymmetric and ring-like large-scale magnetic structures in spiral galaxies. They develop further the idea that bisymmetric structures observed in several galaxies are the result of the generation of non-axisymmetric large-scale magnetic fields by the turbulent dynamo mechanism. Observations indicate the ring-like magnetic structure in M31 and the bisymmetric one in M51. The situation in the Milky Way is more complicated. Our galaxy's rotation is such that a non-axisymmetric magnetic field can only be generated here if the half-thickness of the ionized gaseous disc in the solar vicinity lies between 540 and 720 pc. Otherwise only axisymmetric fields are generated. Unfortunately, observations allow a much wider range of possible disc half-thicknesses, ranging from 400 to 1000 pc. The authors propose some observational tests for verification of their theory.
Baryshnikova Iu.
Ruzmaikin Aleksandr
Shukurov Anvar
Sokoloff Dimitry
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