| A Possible Pumping Mechanism for Interstellar Class Ⅱ 107 GHz Methanol Masers |
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| 引用本文： | Han－PingLiu JinSun. A Possible Pumping Mechanism for Interstellar Class Ⅱ 107 GHz Methanol Masers[J]. 中国天文和天体物理学报, 2002, 2(1): 51-58 |
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| 作者姓名： | Han－PingLiu JinSun |
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| 作者单位： | Han-Ping Liu1 * and Jin Sun2，3 1 Department of Physics，Beijing Normal University，Beijing 100875 2 Department of Astronomy，Beijing Normal University，Beijing 100875 3 CAS-PKU Joint Beijing Astrophysics Center，Peking University，Beijing 100871 Formation |
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| 基金项目： | NationalNatural Science Foundation of China (Nos. l9873003 and 20073005). |
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| 摘 要： | It is recognized that the interstellar methanol-107 GHz masers and OH-4.765 GHz masers towards Class Ⅱ sources are associated with each other and coexist towards ultracompact HⅡ regions. Therefore we suggest a new pumping mechanism-methanol masers without population inversion. It can explain the formation of 107GHz methanol masers, with the 4.765GHz OH masers acting as a driving coherent microwave field. It is argued that this mechanism is compatible with the astronomical conditions.
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| 关 键 词： | 星际分子 天体微波辐射源 HⅡ区 非热致辐射 |
A Possible Pumping Mechanism for Interstellar Class Ⅱ107 GHz Methanol Masers |
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| HanPing Liu,Jin Sun. A Possible Pumping Mechanism for Interstellar Class Ⅱ107 GHz Methanol Masers[J]. Chinese Journal of Astronomy and Astrophysics, 2002, 2(1): 51-58 |
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| Authors: | HanPing Liu Jin Sun |
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| Affiliation: | [1]DepartmentofPhysics,BeijingNormalUniversity,Beijing100875 [2]DepartmentofAstronomy,BeijingNormalUniversity,Beijing100875 |
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| Abstract: | It is recognized that the interstellar methanol-107GHz masers and OH-4.765 GHz masers towards Class II sources are associated with each other and coexist towards ultracompact HII regions. Therefore we suggest a new pumping mechanism - methanol masers without population inversion. It can explain the formation of 107GHz methanol masers, with the 4.765 GHz OH masers acting as a driving coherent microwave field. It is argued that this mechanism is compatible with the astronomical conditions. |
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| Keywords: | HII regions - masers - radiation mechanisms: non-thermal - ISM: molecules - line: formation |
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