Magnetic fields and cosmic rays in M 31

  title={Magnetic fields and cosmic rays in M 31},
  author={Rainer Beck and Elly M. Berkhuijsen and Ren'e Giessubel and D. D. Mulcahy},
  journal={Astronomy \& Astrophysics},
Context. Magnetic fields play an important role in the dynamics and evolution of galaxies; however, the amplification and ordering of the initial seed fields are not fully understood. The nearby spiral galaxy M 31 is an ideal laboratory for extensive studies of magnetic fields. Aims. Our aim was to measure the intrinsic structure of the magnetic fields in M 31 and compare them with dynamo models of field amplification. Methods. The intensity of polarized synchrotron emission and its orientation… 
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