Ie. Val'Tts et al., Detection of new sources of methanol emission at 107 and 108 GHz with the Mopra telescope, M NOT R AST, 310(4), 1999, pp. 1077-1086
A southern hemisphere survey of methanol emission sources in two millimetre
-wave transitions has been carried out using the ATNF Mopra millimetre tele
scope. 16 emission sources have been detected in the 3(1)-4(0) A(+) transit
ion of methanol at 107 GHz, including six new sources exhibiting class II m
ethanol maser emission features. Combining these results with the similar n
orthern hemisphere survey, a total of eleven 107-GHz methanol masers have b
een detected. A survey of the methanol emission in the 0(0)-1(-1) E transit
ion at 108 GHz has resulted in the detection of 16 sources; one of them sho
wing maser characteristics. This is the first methanol maser detected at 10
8 GHz, presumably of class II. The results of large velocity gradient stati
stical equilibrium calculations confirm the classification of these new sou
rces as class II methanol masers.