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Methanol masers and their environment at high resolution
Citation
Phillips, CJ and Norris, RP and Ellingsen, SP and McCulloch, PM, Methanol masers and their environment at high resolution, Monthly Notices of the Royal Astronomical Society, 300, (4) pp. 1131-1157. ISSN 0035-8711 (1998) [Refereed Article]
DOI: doi:10.1046/j.1365-8711.1998.t01-1-01979.x
Abstract
We have used the Australia Telescope Compact Array (ATCA) to make high-resolution images of the 6.7-GHz 51 → 60A+ maser transition of methanol towards 33 sources in the Galactic plane. Including the results from 12 methanol sources in the literature, we find that 17 out of 45 sources have curved or linear morphology. Most of the 17 have a velocity gradient along the line, which is consistent with masers lying in an edge-on circumstellar disc surrounding a massive star. We also made simultaneous continuum observations of the sources at 8.6 GHz, in order to image any associated H II region. 25 of the sources are associated with an ultracompact H II region, with a detection limit of ∼0.5 mJy beam-1. We argue that the methanol sources without an associated H II region represent less massive embedded stars, not an earlier stage in the lifetime of the star, as previously suggested.
Item Details
Item Type: | Refereed Article |
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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: | Phillips, CJ (Dr Christopher Phillips) |
UTAS Author: | Ellingsen, SP (Professor Simon Ellingsen) |
UTAS Author: | McCulloch, PM (Professor Peter McCulloch) |
ID Code: | 13571 |
Year Published: | 1998 |
Web of Science® Times Cited: | 125 |
Deposited By: | Physics |
Deposited On: | 1998-08-01 |
Last Modified: | 2011-08-08 |
Downloads: | 0 |
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