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Methanol Masers: Reliable Tracers of the Early Stages of High-Mass Star Formation


Ellingsen, SP, Methanol Masers: Reliable Tracers of the Early Stages of High-Mass Star Formation, The Astrophysical Journal, 638, (1) pp. 241-261. ISSN 0004-637X (2006) [Refereed Article]

DOI: doi:10.1086/498673


The GLIMPSE and MSX surveys have been used to examine the mid-infrared properties of a statistically complete sample of 6.7 GHz methanol masers. The GLIMPSE point sources associated with methanol masers are clearly distinguished from the majority, typically having extremely red mid-infrared colors similar to those expected of low-mass Class 0 young stellar objects. The intensity of the GLIMPSE sources associated with methanol masers is typically 4 mag brighter at 8.0 μm than at 3.6 μm. Targeted searches toward GLIMPSE point sources with [3.6] - [4.5] > 1.3 and an 8.0 μm magnitude less than 10 will detect more than 80% of Class II methanol masers. Many of the methanol masers are associated with sources within infrared dark clouds (IRDCs), which are believed to mark regions where high-mass star formation is in its very early stages. The presence of Class II methanol masers in a significant fraction of IRDC suggests that high-mass star formation is common in these regions. Different maser species are thought to trace different evolutionary phases of the high-mass star formation process. Comparison of the properties of the GLIMPSE sources associated with Class II methanol masers and other maser species shows interesting trends, consistent with Class I methanol masers tracing a generally earlier evolutionary phase and OH masers tracing a later evolutionary phase. © 2006. The American Astronomical Society. All rights reserved.

Item Details

Item Type:Refereed Article
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:39157
Year Published:2006
Funding Support:Australian Research Council (DP0342478)
Web of Science® Times Cited:124
Deposited By:Physics
Deposited On:2006-08-01
Last Modified:2007-10-11

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