Open AccessDetection of new sources of methanol emission at 107 and 108 GHz with the Mopra telescope
Author(s) -
Val’Tts I. E.,
Ellingsen S. P.,
Slysh V. I.,
Kalenskii S. V.,
Otrupcek R.,
Voronkov M. A.
Publication year - 1999
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1999.03009.x
Subject(s) - maser , physics , methanol , telescope , astrophysics , millimeter , southern hemisphere , radio telescope , emission spectrum , astronomy , spectral line , chemistry , organic chemistry
A southern hemisphere survey of methanol emission sources in two millimetre‐wave transitions has been carried out using the ATNF Mopra millimetre telescope. 16 emission sources have been detected in the 3 1 –4 0 A + transition of methanol at 107 GHz, including six new sources exhibiting class II methanol maser emission features. Combining these results with the similar northern hemisphere survey, a total of eleven 107‐GHz methanol masers have been detected. A survey of the methanol emission in the 0 0 –1 −1 E transition at 108 GHz has resulted in the detection of 16 sources; one of them showing maser characteristics. This is the first methanol maser detected at 108 GHz, presumably of class II. The results of large velocity gradient statistical equilibrium calculations confirm the classification of these new sources as class II methanol masers.