{"title":"星际II类72-81A +和72-81A−甲醇激射器的产生","authors":"Hanping Liu, Jin Sun","doi":"10.1088/1009-9271/7/6/07","DOIUrl":null,"url":null,"abstract":"New methanol maser lines at 72?63A?(86.6 GHz) and 72?63A+(86.9 GHz) together with two candidate methanol maser lines at 72?81A?(80.99 GHz) and 72?81A+(111.29 GHz) have been detected in W3(OH). We use a pumping mechanism, i.e., methanol masers without population inversion, to explain the formation of weak methanol masers of 72?81A+ and 72?81A?. We explain well why the line-shape of the transition 72?81A+ is not typical. A similar argument can be applied to the ?-type level system 72A?, 63A? and 81A?, as well as to the 72?81A? 80.99 GHz masers.","PeriodicalId":124495,"journal":{"name":"Chinese Journal of Astronomy and Astrophysics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Generation of Interstellar Class II 72-81A + and 72-81A − Methanol Masers ∗\",\"authors\":\"Hanping Liu, Jin Sun\",\"doi\":\"10.1088/1009-9271/7/6/07\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"New methanol maser lines at 72?63A?(86.6 GHz) and 72?63A+(86.9 GHz) together with two candidate methanol maser lines at 72?81A?(80.99 GHz) and 72?81A+(111.29 GHz) have been detected in W3(OH). We use a pumping mechanism, i.e., methanol masers without population inversion, to explain the formation of weak methanol masers of 72?81A+ and 72?81A?. We explain well why the line-shape of the transition 72?81A+ is not typical. A similar argument can be applied to the ?-type level system 72A?, 63A? and 81A?, as well as to the 72?81A? 80.99 GHz masers.\",\"PeriodicalId\":124495,\"journal\":{\"name\":\"Chinese Journal of Astronomy and Astrophysics\",\"volume\":\"36 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2007-12-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Chinese Journal of Astronomy and Astrophysics\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1088/1009-9271/7/6/07\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chinese Journal of Astronomy and Astrophysics","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1088/1009-9271/7/6/07","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Generation of Interstellar Class II 72-81A + and 72-81A − Methanol Masers ∗
New methanol maser lines at 72?63A?(86.6 GHz) and 72?63A+(86.9 GHz) together with two candidate methanol maser lines at 72?81A?(80.99 GHz) and 72?81A+(111.29 GHz) have been detected in W3(OH). We use a pumping mechanism, i.e., methanol masers without population inversion, to explain the formation of weak methanol masers of 72?81A+ and 72?81A?. We explain well why the line-shape of the transition 72?81A+ is not typical. A similar argument can be applied to the ?-type level system 72A?, 63A? and 81A?, as well as to the 72?81A? 80.99 GHz masers.
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