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Date and Time of the Query: 2019-06-25 T13:27:31 PDT
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For refcode 1989A&A...208...32H:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1989A&A...208...32H The magnetic field of NGC 6946 J.I. Harnett, R. Beck, and U.R. Buczilowski Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, D-5300 Bonn 1, Federal Republic of Germany Received April 23, accepted July 14, 1988 Summary. We present radio continuum observations of NGC 6946 obtained with the Effelsberg 100-m radio telescope at {lambda} 6.3 cm both in total intensity and linear polarization. Radio emission can be traced out to 24 kpc distance with a radial scale length of 3.1 +/- 0.1 kpc. The average degree of polarization of the synchrotron emission is 9 +/- 2%. The distributions of Faraday rotation measures and magnetic field lines in the disk of NGC 6946 were determined by combination of the {lambda}6.3 cm with previous {lambda}2.8 cm data. The field lines seem to show large three-dimensional deviations from a regular spiral pattern, possibly caused by a warped magnetic field, the transition to an intergalactic magnetic field or density waves. The analysis of the (more reliable) new data at {lambda}6.3cm alone suggests that the field lines follow the irregular optical spiral arm structure. The large-scale magnetic field in NGC 9646 cannot be described by any simple model. Key words: spiral galaxies: NGC 6946 - magnetic field - polarization - radio continuum
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