星际云和星周包层中的碳氢负离子
Hydrocarbon anions in interstellar clouds and circumstellar envelopes
摘要：
最近在星际介质中发现的碳氢阴离子C6 H-使我们开始研究碳氢阴离子在各种星际和星周环境中的合成。我们发现，阴离子/中性丰度比可以是相当大的，在至少百分之几的顺序，一旦中性有超过五个碳原子。详细的模拟表明，IRC+10216和TMC-1中观察到的C6 H-柱密度可以重现。我们的计算还预测，其他碳氢化合物阴离子，如C4 H-和C8 H-，是可行的候选人在IRC+10216，TMC-1和光子为主的地区，如马头星云检测。
英文摘要：
The recent detection of the hydrocarbon anion C6H- in the interstellar medium has led us to investigate the synthesis of hydrocarbon anions in a variety of interstellar and circumstellar environments. We find that the anion/neutral abundance ratio can be quite large, on the order of at least a few percent, once the neutral has more than five carbon atoms. Detailed modeling shows that the column densities of C6H- observed in IRC+10216 and TMC-1 can be reproduced. Our calculations also predict that other hydrocarbon anions, such as C4H- and C8H-, are viable candidates for detection in IRC+10216, TMC-1 and photon-dominated regions such as the Horsehead Nebula.
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