Detection of 36 GHz Class I Methanol Maser Emission toward NGC 4945
- McCarthy, Tiege P.
- Ellingsen, Simon P.
- Chen, Xi
- Breen, Shari L.
- Voronkov, Maxim A.
- Qiao, Hai-hua
DOIAbstract
We have searched for emission from the 36.2 GHz (4(-1) -> 3(0)E) methanol transition toward NGC 4945, using the Australia Telescope Compact Array. 36.2 GHz methanol emission was detected offset southeast from the Galactic nucleus. The methanol emission is narrow, with a line width <10 km s(-1) and a luminosity five orders of magnitude higher than Galactic class I masers from the same transition. These characteristics combined the with physical separation from the strong central thermal emission suggests that the methanol emission is a maser. This emission is a factor of similar to 90 more luminous than the widespread emission detected from the Milky Way central molecular zone. This is the fourth detection of extragalactic class I emission a...
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