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arXiv 0907.4088astro-ph.GA
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大质量恒星形成区DR21(OH)的硫甲醛释放

Thioformaldehyde Emission from the Massive Star-Forming Region DR21(OH)

Alwyn Wootten, Jeffrey G. Mangum

摘要:

我们用与支持用H_2CO作为分子云温度和密度的灵敏探针类似的论据,测量了几个热核源中硫代甲醛(H_2CS)的J=7-6和J=10-9跃迁。这里的目标是调查更密切的条件下产生的H2 CS排放的云核心包含年轻的恒星通过模拟几个过渡。H2 CS分子是稍微不对称的转子,是H2 CO的较重类似物。如在H2 CO中,跃迁在频率上紧密间隔地发生,尽管它们在能量上基本上分离。在230和345 GHz窗口中,源自K=0、1、2、3和4阶梯的H2 CS跃迁可以有效地用于约束密度和温度。作为第一步,在开发使用这些转换作为温度计和密度计,我们调查和模拟的排放众所周知的温暖致密的核心。

英文摘要:

Using arguments parallel to those used in support of using H2CO as a sensitive probe of temperature and density in molecular clouds, we measured the J=7-6 and J=10-9 transitions of thioformaldehyde (H2CS) in several hot core sources. The goal here was to investigate more closely the conditions giving rise to H2CS emission in cloud cores containing young stars by modelling several transitions. The H2CS molecule is a slightly asymmetric rotor, a heavier analogue to H2CO. As in H2CO, transitions occur closely spaced in frequency, though they are substantially separated in energy. Transitions of H2CS originating from the K=0, 1, 2, 3, and 4 ladders in the 230 and 345 GHz windows can productively be used to constrain densities and temperatures. As a first step in developing the use of these transitions as thermometers and densitometers, we surveyed and modeled the emission from well known warm dense cores.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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