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Title:
High-velocity feature of the class I methanol maser in G309.38-0.13
Authors:
Voronkov, M. A.; Caswell, J. L.; Britton, T. R.; Green, J. A.; Sobolev, A. M.; Ellingsen, S. P.
Affiliation:
AA(Australia Telescope National Facility, CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia; Astro Space Centre, Profsouznaya st. 84/32, 117997 Moscow, Russia), AB(Australia Telescope National Facility, CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia), AC(Australia Telescope National Facility, CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia; Macquarie University, Department of Physics and Engineering, NSW 2109, Australia), AD(Australia Telescope National Facility, CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia), AE(Ural State University, Lenin ave. 51, 620083 Ekaterinburg, Russia), AF(School of Mathematics and Physics, University of Tasmania, GPO Box 252-37, Hobart, Tasmania 7000, Australia)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 408, Issue 1, pp. 133-138. (MNRAS Homepage)
Publication Date:
10/2010
Origin:
WILEY
Astronomy Keywords:
masers, ISM: jets and outflows, ISM: molecules
Abstract Copyright:
(c) Journal compilation © 2010 RAS
DOI:
10.1111/j.1365-2966.2010.17222.x
Bibliographic Code:
2010MNRAS.408..133V

Abstract

The Australia Telescope Compact Array (ATCA) has been used to map class I methanol masers at 36 and 44GHz 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-μm emission. The data allowed us to make a serendipitous discovery of a high-velocity 36-GHz spectral feature, which is blueshifted by about 30kms-1 from the peak velocity at this frequency, but spatially located close to (within a few arcseconds of) the brightest maser 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.
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