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- W1981408414 abstract "A survey of the Class I methanol masers in the transition |$7_0-6_1 {rm A}^+$| at 44.07 GHz has been carried out with the Parkes radio telescope. About 250 positions were searched in the direction of Galactic H II regions, |${rm H}_2{rm O}$| masers and 6.7-GHz Class II methanol masers. 55 new methanol emission sources at 44 GHz were detected, amongst which is the second strongest in the sky, M8E, with a flux density of 520 Jy. Most of the newly found sources are associated with |${rm H}_2{rm O}$|, OH and 6.7-GHz methanol masers and presumably are located in the common regions of star formation. A strong anticorrelation between Class I and II methanol masers was discovered. The nature of the anticorrelation is such that strong Class I masers do not co-exist with strong Class II masers and, where Class I and II masers co-exist, they have different radial velocities. The anticorrelation may be a consequence of the pumping radiation field acting on the population inversion, which is different for the two classes of masers. We suggest that the definitions of Class I and II methanol masers should be based solely on their transitions, and not by relating them to a particular type of associated astronomical object, as was originally proposed by Batrla et al. and Menten." @default.
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- W1981408414 date "1994-05-15" @default.
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- W1981408414 title "The Parkes survey of methanol masers at 44.07 GHz" @default.
- W1981408414 doi "https://doi.org/10.1093/mnras/268.2.464" @default.
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