Computer Science
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000immm.proc..201f&link_type=abstract
The interstellar medium in M31 and M33. Proceedings 232. WE-Heraeus Seminar, 22-25 May 2000, Bad Honnef, Germany. Edited by El
Computer Science
Scientific paper
Radial and azimuthal variations of the polarization angle of radio emission are used to infer the three dimensional structure of the regular magnetic field, B, in M31 and M33. We model the polarization angle as a combination of the intrinsic angle of emission, dependent on the component of B perpendicular to the line of sight, Faraday rotation in the galaxy disk, dependent on B parallel to the line of sight, and foreground Faraday rotation by the magnetic field of the Milky Way. The model is fitted to measured polarisation angles obtained from observations at 6, 11 and 20 cm. The regular magnetic field of M31 is basically axisymmetric, strongest at ~ 10 kpc galactocentric radius but significant at 6 < r < 14 kpc and has pitch angles p = -(5°-20°). There are signs that the regular magnetic field in M33 can be described as an axisymmetric field perturbed by a two-armed spiral pattern and that there may be a reversal in the field direction in the outer part of the disk.
Beck Rainer
Berkhuijsen Elly M.
Fletcher Adam
Shukurov Anvar
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