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Date and Time of the Query: 2019-06-26 T15:46:00 PDT
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For refcode 1989A&A...214...47S:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1989A&A...214...47S Observable parameters of spiral galaxies and galactic magnetic fields S. V. Starchenko and A. M. Shukurov Department of Physics and Mathematics, Pedagogical Institute, Ust-Kamenogorsk 492036, USSR Space Research Institute, Academy of Sciences, Profsoyusnaya ul. 84/32, Moscow 117810, USSR Received March 7, accepted October 10, 1988 Summary. We propose a three-dimensional asymptotic dynamo model of large-scale magnetic field generation in spiral galaxies, which depends on only a few observable galactic parameters. Special attention is paid to the origin of bisymmetric global magnetic structures (azimuthal wave number m = 1) and discussion of their spatial and temporal parameters. Properties of the derived solutions are illustrated by specific examples. We demonstrate a high efficiency of the dynamo generation of the bisymmetric magnetic field in M33. The possible presence of the bisymmetric magnetic structure in NGC 6946 and of the axisymmetric one in IC 342, both of which have nearly identical rotation curves, can be explained by presumably smaller thickness of the thermal ionized gaseous disc in NGC 6946. Calculated angular velocities of rotation of non-axisymmetric magnetic structures are close to the spiral pattern angular velocities. Calculated pitch angles of magnetic lines generally agree with observations. We further confirm a possibility of existence of more complicated large-scale magnetic structures in spiral galaxies (m = 2, a quadrisymmetric structure, and possibly even higher ones). Key words: spiral galaxies - interstellar medium - large-scale magnetic fields - turbulent dynamos
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