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Polarisation of Class II Methanol Masers
journal contribution
posted on 2023-05-17, 09:22 authored by Stack, PD, Simon EllingsenSimon EllingsenWe have used the University of Tasmania Mt Pleasant 26-m radio telescope to investigate the polarisation characteristics of a sample of strong 6.7 GHz methanol masers, the first spectral line polarisation observations to be undertaken with this instrument. As part of this process we have developed a new technique for calibrating linear polarisation spectral line observations. This calibration method gives results consistent with more traditional techniques, but requires much less observing time on the telescope. We have made the first polarisation measurements of a number of 6.7 GHz methanol masers and find linear polarisation at levels from a few to 10% in most of the sources we observed, consistent with previous results. We also investigated the circular polarisation produced by Zeeman splitting in the 6.7 GHz methanol maser G9.62+0.20 to get an estimate of the line of sight magnetic field strength of 35 ± 7 mG.
History
Publication title
Publications of the Astronomical Society of AustraliaVolume
28Issue
4Pagination
338-356ISSN
1323-3580Department/School
School of Natural SciencesPublisher
CSIRO PublishingPlace of publication
150 Oxford St, Po Box 1139, Collingwood, Australia, Victoria, 3066Rights statement
Copyright © 2011 CSIRORepository Status
- Restricted