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High-velocity feature of the class I methanol maser in G309.38−0.13


Voronkov, MA and Caswell, JL and Britton, TR and Green, JA and Sobolev, AM and Ellingsen, SP, High-velocity feature of the class I methanol maser in G309.38−0.13, Monthly Notices of the Royal Astronomical Society, 408, (1) pp. 133-138. ISSN 0035-8711 (2010) [Refereed Article]

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DOI: doi:10.1111/j.1365-2966.2010.17222.x


The Australia Telescope Compact Array (ATCA) has been used to map class I methanol masers at 36 and 44 GHz in G309.38−0.13. Maser spots are found at nine locations in an area of 50 ~ 30 arcsec2, with both transitions reliably detected at only two locations. The brightest spot is associated with shocked gas traced by 4.5-m emission. The data allowed us to make a serendipitous discovery of a high-velocity 36-GHz spectral feature, which is blueshifted by about 30 km s−1 from the peak velocity at this frequency, but spatially located close to (within a few arcseconds of) the brightestmaser spot.We interpret this as indicating an outflow parallel to the line of sight. Such a high-velocity spread of maser features, which has not been previously reported in the class I methanol masers associated with a single molecular cloud, suggests that the outflow most likely interacts with a moving parcel of gas.

Item Details

Item Type:Refereed Article
Keywords:masers ISM: jets and outflows 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)
ID Code:65419
Year Published:2010
Web of Science® Times Cited:19
Deposited By:Physics
Deposited On:2010-11-15
Last Modified:2011-03-23

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