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Masers as evolutionary tracers of high-mass star formation


Breen, SL and Ellingsen, SP, Masers as evolutionary tracers of high-mass star formation, Proceedings of the International Astronomical Union, 29 January − 3 February, Stellenbosch, South Africa, pp. 156-160. ISSN 1743-9213 (2012) [Non Refereed Conference Paper]

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DOI: doi:10.1017/S1743921312006837


Determining an evolutionary clock for high-mass star formation is an important step towards realising a unified theory of star formation, as it will enable qualitative studies of the associated high-mass stars to be executed. We have carried out detailed studies of a large number of sources suspected of undergoing high-mass star formation and have found that common maser transitions offer the best opportunity to determine an evolutionary scheme for these objects. We have investigated the relative evolutionary phases of massive star formation associated with the presence or absence of combinations of water, methanol and main-line hydroxyl masers. The locations of the different maser species have been compared with the positions of 1.2 mm dust clumps, radio continuum, GLIMPSE point sources and Extended Green Objects. Comparison between the characteristics of coincident sources has revealed strong evidence for an evolutionary sequence for the different maser species in high-mass star formation regions. We present our proposed sequence for the presence of the common maser species associated with young high-mass stars and highlight recent advances. We discuss future investigations that will be made in this area by comparing data from the Methanol Multibeam (MMB) Survey with chemical clocks from the Millimetre Astronomy Legacy Team 90 GHz (MALT90) Survey.

Item Details

Item Type:Non Refereed Conference Paper
Keywords:masers, ISM, molecules, stars, formation
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:82646
Year Published:2012
Deposited By:Mathematics and Physics
Deposited On:2013-02-08
Last Modified:2013-02-08

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