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1998A&A...335.1117H - Astronomy and Astrophysics, volume 335, 1117-1123 (1998/7-3)
New clues to the magnetic field structure of M 31.
HAN J.L., BECK R. and BERKHUIJSEN E.M.
Abstract (from CDS):
We observed 21 polarized background radio sources in the field of M 31 at 1.365GHz and 1.652GHz, and determined their rotation measures (RMs). The RM data show that the regular magnetic field of the disk probably extends from about 5kpc to 25kpc from the center with similar structure. The RMs obtained from the polarized emission from M 31 at λ6 cm and λ11 cm indicate that M 31 might have a weak poloidal field in its tenuous halo. Observational features of the odd and even dynamo modes in a galaxy are discussed. An even mode (S0) dynamo may operate in M 31.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: magnetic fields - Galaxies: halos - Galaxies: ISM - Galaxies: individual: M 31 - Polarization
Simbad objects: 36
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