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New 9.9-GHz methanol masers


Voronkov, MA and Caswell, JL and Ellingsen, SP and Sobolev, AM, New 9.9-GHz methanol masers, Monthly Notices of the Royal Astronomical Society, 405, (4) pp. 2471-2484. ISSN 0035-8711 (2010) [Refereed Article]

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DOI: doi:10.1111/j.1365-2966.2010.16624.x


The Australia Telescope Compact Array has been used to make the first extensive search for the class I methanol masers at 9.9 GHz. 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 starforming 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.

Item Details

Item Type:Refereed Article
Keywords:masers – stars: formation – ISM: HII regions – ISM: molecules.
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:65440
Year Published:2010
Web of Science® Times Cited:54
Deposited By:Physics
Deposited On:2010-11-16
Last Modified:2011-03-23

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