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Testing maser-based evolutionary schemes: a new search for 37.7-GHz methanol masers


Ellingsen, SP and Breen, SL and Voronkov, MA and Dawson, JR, Testing maser-based evolutionary schemes: a new search for 37.7-GHz methanol masers, Monthly Notices of the Royal Astronomical Society, 429, (4) pp. 3501-3516. ISSN 0035-8711 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 The Authors

DOI: doi:10.1093/mnras/sts621


We have used the Australia Telescope National Facility Mopra 22-m antenna to search for 37.7-GHz (7−2 → 8−1E) methanol masers towards a sample of 36 Class II methanol masers. The target sources are the most luminous Class II methanol masers not previously searched for this transition, with isotropic peak 12.2-GHz maser luminosity greater than 250 Jy kpc2 and isotropic peak 6.7-GHz maser luminosity greater than 800 Jy kpc2. Seven new 37.7-GHz methanol masers were detected as a result of the search. The detection rate for 37.7-GHz methanol masers towards a complete sample of all such Class II methanol maser sites south of declination −20° is at least 30 per cent. The relatively high detection rate for this rare methanol transition is in line with previous predictions that the 37.7-GHz transition is associated with a late stage of the Class II methanol maser phase of high-mass star formation. We find that there is a modest correlation between the ratio of the 6.7- and 37.7-GHz maser peak intensity and the 6.7- and 12.2-GHz maser peak intensity (correlation coefficient 0.63 in a log–log plot). We detected one new 38.3-GHz (62 → 53A) methanol maser towards G 335.789 + 0.174. This is only the fourth source for which maser emission has been detected in this transition and it is the only one for which emission is not also observed in the 38.5-GHz 62 → 53A+ transition.

Item Details

Item Type:Refereed Article
Keywords:masers – stars: formation – 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)
UTAS Author:Dawson, JR (Dr Joanne Dawson)
ID Code:84553
Year Published:2013
Web of Science® Times Cited:15
Deposited By:Mathematics and Physics
Deposited On:2013-05-20
Last Modified:2017-11-03

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