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Title:
New 9.9-GHz methanol masers
Authors:
Voronkov, M. A.; Caswell, J. L.; Ellingsen, S. P.; Sobolev, A. M.
Affiliation:
AA(Australia Telescope National Facility, CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia; Astro Space Centre, Profsouznaya st. 84/32, 117997 Moscow, Russia), AB(Australia Telescope National Facility, CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia), AC(School of Mathematics and Physics, University of Tasmania, GPO Box 252-37, Hobart, Tasmania 7000, Australia), AD(Ural State University, Lenin ave. 51, 620083 Ekaterinburg, Russia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 405, Issue 4, pp. 2471-2484. (MNRAS Homepage)
Publication Date:
07/2010
Origin:
WILEY
Astronomy Keywords:
masers, stars: formation, ISM: HII regions, ISM: molecules
Abstract Copyright:
(c) Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2010.16624.x
Bibliographic Code:
2010MNRAS.405.2471V

Abstract

The Australia Telescope Compact Array has been used to make the first extensive search for the class I methanol masers at 9.9GHz. In total, 48 regions of high-mass star formation were observed. In addition to masers in W33-Met (G12.80-0.19) and G343.12-0.06 (IRAS 16547-4247) which have already been reported in the literature, two new 9.9-GHz masers have been found towards G331.13-0.24 and G19.61-0.23. We have determined absolute positions (accurate to roughly a second of arc) for all the detected masers and suggest that some class I masers may be associated with shocks driven into molecular clouds by expanding HII regions. Our observations also imply that the evolutionary stage of a high-mass star-forming region when the class I masers are present can outlast the stage when the class II masers at 6.7-GHz are detectable, and overlaps significantly with the stage when OH masers are active.
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