Ambipolar-Diffusion Timescale, Star Formation Timescale, and the Ages of Molecular Clouds: Is There a Discrepancy?
Ambipolar-Diffusion Timescale, Star Formation Timescale, and the Ages of Molecular Clouds: Is There a Discrepancy?
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双极扩散时标、恒星形成时标和分子云的年龄：是否存在差异？
DOI：
10.1086/424901
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
T. Mouschovias
中科院分区：
文献类型：
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作者：
K. Tassis;T. Mouschovias
我们根据金牛座 T 星的年龄、星团中恒星的年龄分布以及前恒星核心的统计数据，重新审视了对恒星形成不同阶段的持续时间和分子云寿命的估计。我们表明，所有可用的观测数据都与相当于约 107 年的分子云寿命一致，也与自启动双极扩散控制恒星形成理论的预测一致。我们的结论是，不存在任何观测支持“年轻”分子云或“快速”恒星形成。
We reexamine critically the estimates of the duration of different phases of star formation and the lifetimes of molecular clouds based on the ages of T Tauri stars, age spreads of stars in clusters, and statistics of prestellar cores. We show that all available observational data are consistent with lifetimes of molecular clouds comparable to ≈107 yr, as well as with the predictions of the theory of self-initiated, ambipolar-diffusion-controlled star formation. We conclude that there exists no observational support for either "young" molecular clouds or "rapid" star formation.