TMC-1的新标准化学成分
A New Reference Chemical Composition for TMC-1
摘要：
最近在暗云中探测到复杂的有机分子，重新点燃了人们对这些环境的天体化学建模的兴趣。由于TMC-1的相对接近性和丰富的分子复杂性，它已被广泛观测，以研究乌云中发生的化学过程。我们使用局部热平衡辐射转移模型，再加上贝叶斯统计方法，考虑到离群值的TMC-1的野边山光谱调查8和50 GHz之间的数据进行分析。我们计算了TMC-1中57个分子相对于分子氢的丰度，包括19个同位素体及其相关的不确定性。新的结果与Ohishi & Kaifu先前的丰度测定以及Agundez & Wakelam在评论中报告的值基本一致。然而，在某些情况下，较大的不透明度和较低的信噪比效应仅允许分别导出上限或下限。
英文摘要：
Recent detections of complex organic molecules in dark clouds have rekindled interest in the astrochemical modeling of these environments. Because of its relative closeness and rich molecular complexity, TMC-1 has been extensively observed to study the chemical processes taking place in dark clouds. We use local thermodynamical equilibrium radiative transfer modeling coupled with a Bayesian statistical method which takes into account outliers to analyze the data from the Nobeyama spectral survey of TMC-1 between 8 and 50 GHz. We compute the abundance relative to molecular hydrogen of 57 molecules, including 19 isotopologues in TMC-1 along with their associated uncertainty. The new results are in general agreement with previous abundance determination from Ohishi & Kaifu and the values reported in the review from Agundez & Wakelam. However, in some cases, large opacity and low signal to noise effects allow only upper or lower limits to be derived, respectively.
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