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Polarisation of Class II Methanol Masers

Published online by Cambridge University Press:  02 January 2013

P. D. Stack  and
S. P. Ellingsen
P. D. Stack
Affiliation:
School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia
S. P. Ellingsen*
Affiliation:
School of Mathematics and Physics, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001, Australia
*
BCorresponding author. Email: [email protected]
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Abstract

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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.

Keywords

maserspolarisation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 28 , Issue 4 , 2011 , pp. 338 - 356
Copyright
Copyright © Astronomical Society of Australia 2011

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