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星际H2O与OH分子脉泽的统计与激发机制探讨

The Survey and Its Interpretation for Interstellar OH and H2O Masers

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【作者】 刘汉淜; Forster J R; 孙锦;

【Author】 LIU Han-peng1, Forster J R2, SUN Jin3 1. Department of Physics, Beijing Normal University, Beijing 100875, China 2. University of California, Berkeley, Hat Creek Radio Observatory, 42231 Bidwell Road, Hat Creek, CA 96040, U.S.A 3. Department of Astronomy, Beijing Normal University, Beijing 100875, China

【机构】 北京师范大学物理系; University of California Berkeley; 42231 Bidwell Road; Hat Creek; CA96040; 北京师范大学天文系; 北京100875;

【摘要】 报告了大质量恒星形成区的星际分子脉泽巡天观测结果。所观测到的H2O与OH分子脉泽可分为三类,它们的数量近似相等,寿命亦近似相等~105年,但HⅡ区普遍短缺。提出了一种新的辐射机制模型,它克服了旧辐射模型的缺点,可以解释星际H2O与OH脉泽的成因,以及作者的观测统计结果。

【Abstract】 A statistics of sky survey for interstellar H2O and OH masers is presented. These masers can be classified into 3 categories. The total number of sources in each category is of the same order of magnitude, and they can maintain-105 years. But there are fewer than half masers with detectable HⅡ regions. An improved radiative pumping mechanism is proposed, and it overcame the known drawback of former radiative models. The observationally statistical results can be interpreted by both the new mechanism and the evolutional model with gravitational force of star responsible for the HⅡ region.

【基金】 国家自然科学基金(20073005,19873003)资助项目
  • 【文献出处】 光谱学与光谱分析 ,Spectroscopy and Spectral Analysis , 编辑部邮箱 ,2006年03期
  • 【分类号】O561
  • 【下载频次】50
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