High Resolution Polarization Observations of M31
The radio continuum emission of M31 is concentrated in a “ring”-like structure which is also seen in many other constituents (e.g. HI, Hα, FIR, UV). The real structure of M31 is difficult to determine because of its high inclination. The first reliable polarization observations of M31 made at λ11 cm with the 100-m telescope of the MPIPR were published by BECK et al. , showing that also the polarized intensity is seen in this ring. These data were analysed by SOFUE and TAKANO  and BECK  who showed that the change of position angle of the E-vector with azimuthal angle was consistent with a ring-like magnetic field configuration. Only very few galaxies show such a distribution (e.g. SOFUE et al. , BECK ). More recent λ6 cm observations (BERKHUIJSEN et al., this volume), which are nearly free of Faraday effects, indicate again a ring-like field structure.
KeywordsPolarization Angle Pitch Angle Azimuthal Angle Magnetic Field Line Rotation Measure
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