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Date and Time of the Query: 2019-06-19 T04:26:02 PDT
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For refcode 1988A&A...192...19L:
Retrieve 6 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1988A&A...192...19L Physical conditions in spiral galaxies supporting strong dynamo action H. Lesch, T. Sawa, M. Krause, R. Beck, M. Fujimoto, and P.L. Biermann Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, D-5300 Bonn 1, Federal Republic of Germany Aichi University of Education, Department of Earth Sciences, Kariya 448, Japan Nagoya University, Department of Physics, Faculty of Science, Chikusa, Nagoya 464, Japan Received May 13, accepted August 4, 1987 Summary. An attempt is made to derive the physical conditions favourable for the excitation of a bisymmetric magnetic field structure by a galactic dynamo, based on polarization observations of six spiral galaxies (M31, M33, M51, M81, IC 342, NGC 6946), the extended version of Parker's induction equation and the rotation curves. The ionized phase of the interstellar medium is shown to be the location of dynamo action. The strength of the dynamo is mainly determined by the differential rotation and the shear between the gas and the density wave. The theoretical results agree very well with the observations: Axisym- metric dynamo modes in IC 342 and M31 and bisymmetric modes in M33 and M81. For M51 and NGC 6946 bisymmetric modes are expected. Key words: spiral galaxies - interstellar magnetic fields - hydromagnetic dynamos - density waves
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