Methyltriacetylene (CH3C6H) toward TMC-1: The Largest Detected Symmetric Top
Methyltriacetylene (CH3C6H) toward TMC-1: The Largest Detected Symmetric Top
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甲基三乙炔 (CH3C6H) 朝向 TMC-1：检测到的最大对称顶
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
F. Lovas
中科院分区：
文献类型：
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作者：
A. Remijan;J. Hollis;L. Snyder;P. Jewell;F. Lovas
我们报告的检测一个新的星际甲基聚炔，CH 3C 6 H（甲基三乙炔），与100米绿色银行望远镜。在金牛座分子云（TMC-1）中探测到了该物种的10条谱线：12，K-11，K，13，K-12，K，14，K-13，K，15，K-14，K和16，K-15，K跃迁的K = 0和K = 1分量。还观察到CH_3C_4 H（甲基丁二炔）的6，K-5，K跃迁的K = 0和K = 1分量。对于两种甲基多炔，没有检测到更高能量的K-组分，这与TMC-1暗云的10 K动力学温度一致。此外，无线电光谱线数据的cyanopolyyne，methylcyanopolyyne，和methylpolyyne碳链序列进行了研究，并发现强相关性的值之间的三个不同的碳链斜率时，总列密度的序列成员绘制对碳链中的碳原子数。这一结果表明，所有这些碳链序列的形成化学是共同的，并预测在每三个碳链序列中的下一个较大的，未检测到的物种的总柱密度。
We report the detection of a new interstellar methylpolyyne, CH3C6H (methyltriacetylene), with the 100 m Green Bank Telescope. Ten spectral lines of this species were detected toward the Taurus molecular cloud (TMC-1): the K = 0 and K = 1 components of the 12,K-11,K, 13,K-12,K, 14,K-13,K, 15,K-14,K, and 16,K-15,K transitions. Also observed were the K = 0 and K = 1 components of the 6,K-5,K transition of CH3C4H (methyldiacetylene). For both methylpolyynes, no higher energy K-components were detected, which is consistent with the 10 K kinetic temperature of the TMC-1 dark cloud. Moreover, radio spectral line data of the cyanopolyyne, methylcyanopolyyne, and methylpolyyne carbon-chain sequences were studied, and strong correlations are found among the values of the three different carbon-chain slopes when total column densities of sequence members are plotted against the number of carbon atoms in the carbon chain. This result suggests that the formation chemistry for all these carbon-chain sequences is common, and the total column density of the next larger, undetected species in each of the three carbon chain sequences is predicted.