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We present the unambiguous discovery of six new class II methanol masertransitions, three of which are torsionally excited (vt=1). The newlydiscovered 6.18-GHz 17_-2 -> 18_-3 E (vt=1), 7.68-GHz 12_4 -> 13_3 A- (vt=0),7.83-GHz 12_4 -> 13_3 A+ (vt = 0), 20.9-GHz 10_1 -> 11_2 A+ (vt=1), 44.9-GHz2_0 -> 3_1 E (vt=1) and 45.8-GHz 9_3 -> 10_2 E (vt=0) methanol masers weredetected towards G358.931-0.030, where the known 6.68-GHz maser has recentlybeen reported to be undergoing a period flaring. The detection of the vt=1torsionally excited lines corroborates one of the missing puzzle pieces inclass II maser pumping, but the intensity of the detected emission provides anadditional challenge, especially in the case of the very highly excited6.18-GHz line. Together with the newly detected vt=0 lines, these observationsprovide significant new information which can be utilised to improve class IImethanol maser modelling. We additionally present detections of 6.68-, 19.9-,23.1- and 37.7-GHz class II masers, as well as 36.2- and 44.1-GHz class Imethanol masers, and provide upper limits for the 38.3- and 38.5-GHz class IIlines. Near simultaneous Australia Telescope Compact Array (ATCA) observationsconfirm that all 10 of the class II methanol maser detections are co-spatial to~0.2 arcsec, which is within the uncertainty of the observations. We findsignificant levels of linearly polarised emission in the 6.18-, 6.67-, 7.68-,7.83-, 20.9-, 37.7-, 44.9- and 45.8-GHz transitions, and low levels of circularpolarisation in the 6.68-, 37.7- and 45.8-GHz transitions.

the astrophysical journal. letters

Discovery of six new class II methanol maser transitions, including the  unambiguous detection of three torsionally excited lines toward  G358.931-0.030