Detection of new sources of methanol emission at 107 and 108 GHz with the Mopra telescope

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.