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Polarisation of Class II Methanol Masers

Citation

Stack, PD and Ellingsen, SP, Polarisation of Class II Methanol Masers, Publications of the Astronomical Society of Australia, 28, (4) pp. 338-356. ISSN 1323-3580 (2011) [Refereed Article]


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Copyright Statement

Copyright © 2011 CSIRO

DOI: doi:10.1071/AS11029

Abstract

We 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.

Item Details

Item Type:Refereed Article
Keywords:masers — polarisation
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Stack, PD (Mr Paul Stack)
Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:74491
Year Published:2011
Deposited By:Mathematics and Physics
Deposited On:2011-12-05
Last Modified:2017-11-01
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