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Multibeam maser survey of methanol and excited OH in the Magellanic Clouds: new detections and maser abundance estimates


Green, JA and Caswell, JL and Fuller, GA and Breen, SL and Brooks, K and Burton, MG and Chrysostomou, A and Cox, J and Diamond, PJ and Ellingsen, SP and Gray, MD and Hoare, MG and Masheder, MRW and McClure-Griffiths, N and Pestalozzi, M and Phillips, C and Quinn, L and Thompson, MA and Voronkov, M and Walsh, A and Ward-Thompson, D and Wong-McSweeney, D and Yates, JA and Cohen, RJ, Multibeam maser survey of methanol and excited OH in the Magellanic Clouds: new detections and maser abundance estimates, Monthly Notices of the Royal Astronomical Society, 385, (2) pp. 948-956. ISSN 0035-8711 (2008) [Refereed Article]

DOI: doi:10.1111/j.1365-2966.2008.12888.x


We present the results of the first complete survey of the Large (LMC) and Small (SMC)Magellanic Clouds for 6668-MHz methanol and 6035-MHz excited-state hydroxyl masers. In addition to the survey, higher sensitivity targeted searches towards known star formation regions were conducted. The observations yielded the discovery of a fourth 6668-MHz methanol maser in the LMC, found towards the star-forming region N160a, and a second 6035-MHz excited-state hydroxyl maser, found towards N157a. We have also re-observed the three previously known 6668-MHz methanol masers and the single 6035-MHz hydroxyl maser. We failed to detect emission from either transition in the SMC. All observations were initially made using the Methanol Multibeam (MMB) survey receiver on the 64-m Parkes telescope as part of the MMB project and accurate positions have been measured with the Australia Telescope Compact Array. We compare the maser populations in the Magellanic Clouds with those of our Galaxy and discuss their implications for the relative rates of massive star formation, heavy metal abundance and the abundance of complex molecules. The LMC maser populations are demonstrated to be smaller than their Milky Way counterparts. Methanol masers are underabundant by a factor of "~45, whilst hydroxyl and water masers are a factor of "~10 less abundant than our Galaxy.

Item Details

Item Type:Refereed Article
Keywords:masers, surveys, stars, formation, magellanic clouds
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:Breen, SL (Dr Shari Breen)
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
ID Code:51446
Year Published:2008
Funding Support:Australian Research Council (DP0770157)
Web of Science® Times Cited:45
Deposited By:Physics
Deposited On:2008-03-19
Last Modified:2009-04-23

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