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Multitransition study and new detections of class II methanol masers
Citation
Cragg, DM and Sobolev, AM and Ellingsen, SP and Caswell, JL and Godfrey, PD and Salii, SV and Dodson, R, Multitransition study and new detections of class II methanol masers, Monthly Notices of the Royal Astronomical Society, 323, (4) pp. 939-951. ISSN 0035-8711 (2001) [Refereed Article]
DOI: doi:10.1046/j.1365-8711.2001.04294.x
Abstract
We have used the ATNF Mopra antenna and the SEST antenna to search in the directions of several class II methanol maser sources for emission from six methanol transitions in the frequency range 85-115 GHz. The transitions were selected from excitation studies as potential maser candidates. Methanol emission at one or more frequencies was detected from five of the maser sources, as well as from Orion KL. Although the lines are weak, we find evidence of maser origin for three new lines in G345.01 + 1.79, and possibly one new line in G9.62+0.20. The observations, together with published maser observations at other frequencies, are compared with methanol maser modelling for G345.01 + 1.79 and NGC 6334F. We find that the majority of observations in both sources are consistent with a warm dust (175K) pumping model at hydrogen density ∼106cm-3 and methanol column density ∼5 × 1017 cm-2. The substantial differences between the maser spectra in the two sources can be attributed to the geometry of the maser region.
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) |
UTAS Author: | Dodson, R (Mr Richard Dodson) |
ID Code: | 22068 |
Year Published: | 2001 |
Web of Science® Times Cited: | 43 |
Deposited By: | Physics |
Deposited On: | 2001-08-01 |
Last Modified: | 2002-05-09 |
Downloads: | 0 |
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