Galactic methanol masers at 6.6 GHz

Details Galactic methanol masers at 6.6 GHz Galactic methanol masers at 6.6 GHz

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.272...96c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 272, Issue 1, pp. 96-138.

Astronomy and Astrophysics

Astronomy

196

Masers-Stars, Formation-Ism, Molecules-Radio Lines, Ism.

Scientific paper

We have searched for 6.6-GHz methanol maser emission from the directions of more than 200 OH masers, together with a number of other sites of star formation. We have also observed previously reported methanol masers south of declination 24 deg. Where we detected methanol emission, we measured its position and have found more than 40 instances of small clusters of sources. We present observations of a total of 245 methanol masers with peak intensities ranging from 0.3 to 5000 Jy. For a typical source, the velocity range of the emission is quite large - commonly 10 km s^-1 and, in a few instances, exceeding 20 km s^-1. Some of the largest velocity ranges are suggestive of emission from an outflow region as well as a central source. Our observtions over several epochs show that many sources possess at least some features whose intensity varies on a time-scale of several months. Towards most of the 6.6-GHz masers we have searched for 12-GHz methanol maser emission, and have made 131 detections; the median ratio of 12-to 6.6-GHz intensity if 0.11. We discuss the general properties of this large sample of 6.6-GHz methanol masers. They appear to be more prevalent than OH masers, with intensities typically seven times higher, and are thus excellent tracers of compact H II regions and sites of recent star formation.

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