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37 GHz methanol masers: Horsemen of the apocalypse for the class II methanol maser phase?
Citation
Ellingsen, SP and Breen, SL and Sobolev, AM and Voronkov, MA and Caswell, JL and Lo, N, 37 GHz methanol masers: Horsemen of the apocalypse for the class II methanol maser phase?, The Astrophysical Journal: An International Review of Astronomy and Astronomical Physics, 742, (2) Article 109. ISSN 0004-637X (2011) [Refereed Article]
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Copyright Statement
Copyright 2011. The American Astronomical Society.
DOI: doi:10.1088/0004-637X/742/2/109
Abstract
We report the results of a search for class II methanol masers at 37.7, 38.3, and 38.5 GHz toward a sample of 70 high-mass star formation regions. We primarily searched toward regions known to show emission either from the 107 GHz class II methanol maser transition, or from the 6.035 GHz excited OH transition. We detected maser emission from 13 sources in the 37.7 GHz transition, eight of these being new detections. We detected maser emission from three sources in the 38 GHz transitions, one of which is a new detection. We find that 37.7 GHz methanol masers are only associated with the most luminous 6.7 and 12.2 GHz methanol maser sources, which in turn are hypothesized to be the oldest class II methanol sources. We suggest that the 37.7 GHz methanol masers are associated with a brief evolutionary phase (of 1000-4000 years) prior to the cessation of class II methanol maser activity in the associated high-mass star formation region.
Item Details
Item Type: | Refereed Article |
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Keywords: | ISM: molecules - masers - radio lines: ISM - 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) |
UTAS Author: | Breen, SL (Dr Shari Breen) |
ID Code: | 74278 |
Year Published: | 2011 |
Web of Science® Times Cited: | 26 |
Deposited By: | Mathematics and Physics |
Deposited On: | 2011-11-17 |
Last Modified: | 2017-11-03 |
Downloads: | 0 |
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