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OH main line masers in the M 82 starburst

Published online by Cambridge University Press:  01 March 2007

M. K. Argo ,
A. Pedlar ,
T. W. B. Muxlow  and
R. J. Beswick
M. K. Argo
Affiliation:
Jodrell Bank Observatory, University of Manchester, Macclesfield, Cheshire SK11 9DL, UK
A. Pedlar
Affiliation:
Jodrell Bank Observatory, University of Manchester, Macclesfield, Cheshire SK11 9DL, UK
T. W. B. Muxlow
Affiliation:
Jodrell Bank Observatory, University of Manchester, Macclesfield, Cheshire SK11 9DL, UK
R. J. Beswick
Affiliation:
Jodrell Bank Observatory, University of Manchester, Macclesfield, Cheshire SK11 9DL, UK
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Abstract

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A study of the distribution of OH gas in the central region of the nearby active starburst galaxy M82 has confirmed two previously known bright masers and revealed several new main line masers. Three of these are seen only at 1665 MHz, one is detected only at 1667 MHz, while the rest are detected in both lines. Observations covering both the 1665 and 1667 MHz lines, conducted with both the Very Large Array (VLA) and the Multi-Element Radio Linked Interferometer Network (MERLIN), have been used to accurately measure the positions and velocities of these features. This has allowed a comparison with catalogued continuum features in the starburst such as HII regions and supernova remnants, as well as known water and satellite line OH masers. Most of the main line masers appear to be associated with known HII regions although the two detected only at 1665 MHz are seen along the same line of sight as known supernova remnants.

Keywords

masersgalaxies: individual: M82galaxies: ISMgalaxies: starburst
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 427 - 431
Copyright
Copyright © International Astronomical Union 2008

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