Journal
ASTRONOMY & ASTROPHYSICS
Volume 471, Issue 2, Pages L21-L24Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20077635
Keywords
magnetic fields; radio continuum : ISM; ISM : magnetic fields; ISM : structure; techniques : polarimetric; techniques : miscellaneous
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Aims. We investigate the distribution and properties of Faraday rotating and synchrotron emitting regions in the Galactic ISM in the direction of the Galactic anti-centre. Methods. We apply Faraday tomography to a radio polarization dataset that we obtained with the WSRT. We developed a new method to calculate a linear fit to periodic data, which we use to determine rotation measures from our polarization angle data. From simulations of a Faraday screen + noise we could determine how compatible the data are with Faraday screens. Results. An unexpectedly large fraction of 14% of the lines-of-sight in our dataset show an unresolved main component in the Faraday depth spectrum. For lines-of-sight with a single unresolved component we demonstrate that a Faraday screen in front of a synchrotron emitting region that contains a turbulent magnetic field component can explain the data.
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