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VLBI OH maser polarimetry with the Australian Long Baseline Array: the star-forming region G340.054–0.244

Published online by Cambridge University Press:  01 March 2007

I. Bains ,
J. Caswell ,
A. M. S. Richards ,
C. Phillips ,
S. Tingay ,
B. Hutawarakorn Kramer ,
R. J. Cohen  and
M. Cunningham
I. Bains
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia email: ibains@astro.swin.edu.au School of Physics, University of New South Wales, Sydney, NSW 2052, Australia
J. Caswell
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia
A. M. S. Richards
Affiliation:
Jodrell Bank Observatory, Department of Physics and Astronomy, University of Manchester, Macclesfield, Cheshire, SK11 9DL, UK
C. Phillips
Affiliation:
Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 1710, Australia
S. Tingay
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia email: ibains@astro.swin.edu.au
B. Hutawarakorn Kramer
Affiliation:
National Astronomical Reseach Institute of Thailand, Physics Building, Chiang Mai University 502000, Thailand
R. J. Cohen
Affiliation:
Jodrell Bank Observatory, Department of Physics and Astronomy, University of Manchester, Macclesfield, Cheshire, SK11 9DL, UK
M. Cunningham
Affiliation:
School of Physics, University of New South Wales, Sydney, NSW 2052, Australia
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Abstract

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Until recently, high spatial resolution full Stokes maser polarimetry was the sole domain of northern interferometers and a wealth of sources in the far south remained unexplored due to a lack of suitable instrumentation having both high spatial and high velocity resolution. The Australia Telescope Long Baseline Array (LBA) has now switched to disk-based software correlation, permitting full Stokes observing in spectral line mode with velocity channels which are sufficiently narrow to sample usefully the polarization structure. To illustrate the utility of this valuable addition to radio astronomy, we present preliminary results of the first such polarimetric observation, the subject of which are the OH masers in the star-forming region G340.054–0.244.

Keywords

maserspolarizationtechniques: interferometerstechniques: high angular resolutionstars: formationISM: individual (G340.054–0.244)ISM: magnetic fieldsISM: moleculesradio lines: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 64 - 65
Copyright
Copyright © International Astronomical Union 2008

References

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