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Discovery of polarized 6.7-GHz methanol masers in DR21/W75

Published online by Cambridge University Press:  01 March 2007

L. Harvey-Smith ,
R. Soria-Ruiz ,
A. Duarte-Cabral  and
R. J. Cohen
L. Harvey-Smith
Affiliation:
Joint Institute for VLBI in Europe, Postbus 2, 7990 AA, The Netherlands.
R. Soria-Ruiz
Affiliation:
Joint Institute for VLBI in Europe, Postbus 2, 7990 AA, The Netherlands.
A. Duarte-Cabral
Affiliation:
Joint Institute for VLBI in Europe, Postbus 2, 7990 AA, The Netherlands. University of Porto, Rua Campo Alegre 687, 4169-007 Porto, Portugal.
R. J. Cohen
Affiliation:
Jodrell Bank Observatory, Macclesfield, Cheshire, SK11 9DL, UK. (Deceased)
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Abstract

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We present the first images of 6.7 GHz methanol masers in the DR21 star-forming complex. We have discovered two sites of Class II methanol maser emission; in DR21(OH) and DR21(OH)N. The emission comprises clusters of linearly extended masers which have velocity gradients along their length. There are four maser spots in DR21(OH)N, some of which show a small fraction of linear polarization. The twelve masers in DR21(OH) lie in a linear arrangement stretching approximately 0.7 arcseconds and show no significant linear polarization. We were not able to detect any circular polarization in the masers.

Keywords

masers(ISM:) HII regionsISM: moleculesradio lines: ISMstars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 154 - 155
Copyright
Copyright © International Astronomical Union 2008

References

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