在TMC - 1中发现CHCHCCH并检测到HCCN、HCN、CHCHCN以及初步检测到CHCHCCH。
Discovery of CHCHCCH and detection of HCCN, HCN, CHCHCN, and, tentatively, CHCHCCH in TMC-1.
作者信息
Cernicharo J, Agúndez M, Cabezas C, Marcelino N, Tercero B, Pardo J R, Gallego J D, Tercero F, López-Pérez J A, de Vicente P
机构信息
Grupo de Astrofísica Molecular, Instituto de Física Fundamental (IFF-CSIC), C/ Serrano 121, 28006 Madrid, Spain.
Centro de Desarrollos Tecnológicos, Observatorio de Yebes (IGN), 19141 Yebes, Guadalajara, Spain.
出版信息
Astron Astrophys. 2021 Mar 10;647. doi: 10.1051/0004-6361/202140434. eCollection 2021 Mar.
We present the discovery in TMC-1 of vinyl acetylene, CHCHCCH, and the detection, for the first time in a cold dark cloud, of HCCN, HCN, and CHCHCN. A tentative detection of CHCHCCH is also reported. The column density of vinyl acetylene is (1.2±0.2)×10 cm, which makes it one of the most abundant closed-shell hydrocarbons detected in TMC-1. Its abundance is only three times lower than that of propylene, CHCHCH. The column densities derived for HCCN and HCN are (4.4±0.4)×10 cm and (3.7±0.4)×10 cm, respectively. Hence, the HCCN/HCN abundance ratio is 1.2±0.3. For ethyl cyanide we derive a column density of (1.1 ±0.3)×10 cm. These results are compared with a state-of-the-art chemical model of TMC-1, which is able to account for the observed abundances of these molecules through gas-phase chemical routes.
我们展示了在TMC-1中发现乙烯基乙炔（CHCHCCH），以及在冷暗云中首次检测到HCCN、HCN和CHCHCN。还报告了对CHCHCCH的初步检测。乙烯基乙炔的柱密度为(1.2±0.2)×10 cm，这使其成为在TMC-1中检测到的最丰富的闭壳烃之一。其丰度仅比丙烯（CHCHCH）低三倍。HCCN和HCN的柱密度分别为(4.4±0.4)×10 cm和(3.7±0.4)×10 cm。因此，HCCN/HCN丰度比为1.2±0.3。对于乙腈，我们得出的柱密度为(1.1 ±0.3)×10 cm。这些结果与TMC-1的最新化学模型进行了比较，该模型能够通过气相化学途径解释这些分子的观测丰度。
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