Synthesis images of 6.7-GHz methanol masers
We have produced images of a number of galactic methanol sources in the 6.7 GHz (51−60A+) transition, and compared them with earlier maps of the 12.2-GHz (20 - 3-1 E) methanol masers. We find that, in several cases, the 6.7-GHz and 12.2-GHz maser positions are coincident to within 20 milliarcsec, placing a tight constraint on pumping mechanisms. We also confirm the 12.2-GHz result that the methanol masers tend to be located along lines, perhaps indicating jets, shock fronts, or edge-on protoplanetary discs.
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