论文标题
在TMC-1条件下的Isocyanopolyne Chemistry检测星际HC $ _4 $ NC和调查
Detection of Interstellar HC$_4$NC and an Investigation of Isocyanopolyyne Chemistry under TMC-1 Conditions
论文作者
论文摘要
我们在星际培养基中首次报告了HC $ _4 $ NC的天文学检测，而绿色银行望远镜朝着TMC-1分子云的最低意义为$ 10.5σ$。 HC $ _4 $ NC的总柱密度和激发温度确定为$ 3.29^{+8.60} _ { - 1.20} \ times 10^{11} $ cm $ $^{ - 2} $和$ 6.7^{+0.3} {+0.3} _ { - 0.3} _ { - 0.3} $ K，分别使用MCMC分析。除HC $ _4 $ NC外，还明确检测到HCCNC，而没有清楚地检测到HC $ _6 $ NC。我们建议，质子化的氰基的解离重组，hc $ _5 $ _5 $ nh $^+$，而质子化的异氰酸盐，hc $ _4 $ _4 $ nch $^+$，是HC $ _4 $ nc的主要形式机制，而其销毁是由简单的反应而统治的。使用拟议的化学网络，令人满意地重现了观察到的HC $ _4 $ NC和HCCNC的丰度。
We report an astronomical detection of HC$_4$NC for the first time in the interstellar medium with the Green Bank Telescope toward the TMC-1 molecular cloud with a minimum significance of $10.5 σ$. The total column density and excitation temperature of HC$_4$NC are determined to be $3.29^{+8.60}_{-1.20}\times 10^{11}$ cm$^{-2}$ and $6.7^{+0.3}_{-0.3}$ K, respectively, using the MCMC analysis. In addition to HC$_4$NC, HCCNC is distinctly detected whereas no clear detection of HC$_6$NC is made. We propose that the dissociative recombination of the protonated cyanopolyyne, HC$_5$NH$^+$, and the protonated isocyanopolyyne, HC$_4$NCH$^+$, are the main formation mechanisms for HC$_4$NC while its destruction is dominated by reactions with simple ions and atomic carbon. With the proposed chemical networks, the observed abundances of HC$_4$NC and HCCNC are reproduced satisfactorily.
