Photodissociative Regulation of Star Formation in Metal-free Pregalactic Clouds
Photodissociative Regulation of Star Formation in Metal-free Pregalactic Clouds
复制标题
无金属银河系前云中恒星形成的光解离调节
DOI：
10.1086/307285
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
R. Nishi
中科院分区：
文献类型：
--
作者：
K. Omukai;R. Nishi
我们研究了原始气体云中OB星周围的H2光解离区域，其维里温度在几百到几千开尔文之间。在这样的小天体中，一颗O型星星可以光离解出质量等于星云本身的质量。结果，云耗尽了它们的分子冷却剂，不能在自由落体的时间内冷却，随后的星星形成被完全淬灭。这表明恒星在小天体中不能有效地形成，这些天体对宇宙的再电离贡献很小。
We study the H2 photodissociation regions around OB stars in primordial gas clouds whose virial temperatures are between a few hundred and a few thousand Kelvin. In such small objects, a single O star can photodissociate a mass equal to that of the cloud itself. As a result, the clouds deplete their molecular coolant and cannot cool in a free-fall time, and subsequent star formation is totally quenched. This indicates that stars do not form efficiently in small objects and that these objects contribute little to the reionization of the universe.