Bisymmetric open-spiral configuration of magnetic fields in the galaxies M 51 and M 81

Details Bisymmetric open-spiral configuration of magnetic fields in the galaxies M 51 and M 81 Bisymmetric open-spiral configuration of magnetic fields in the galaxies M 51 and M 81

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....91..335s&link_type=abstract

Astronomy and Astrophysics, vol. 91, no. 3, Nov. 1980, p. 335-340. Ministry of Education

Astronomy and Astrophysics

Astrophysics

38

Galactic Rotation, Interstellar Magnetic Fields, Linear Polarization, Magnetic Field Configurations, Radio Observation, Spiral Galaxies, Faraday Effect, Polarized Radiation, Radio Emission, Shock Wave Propagation

Scientific paper

Positional variations are studied of the Faraday rotation measure (RM) of linearly polarized radio waves from the spiral galaxies M 51 and M 81. A double periodicity is found in the RM distribution round the center of the galaxy, which indicates the presence of a bisymmetric and open-spiral magnetic field in the galactic plane. The field configuration suggests a primordial origin of the galactic magnetic fields. The field strength is estimated as 5 10-6 G in the disk of M 51, and 3 10-6 G in M 81, if the electron density and the distribution law of magnetic fields are similar to those in our Galaxy.

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