Discovery of CH2CHCCH and detection of HCCN, HC4N, CH3CH2CN, and, tentatively, CH3CH2CCH in TMC-1
| Autor: | Cernicharo, J., Agundez, M., Cabezas, C., Marcelino, N., Tercero, B., Pardo, J. R., Gallego, J. D., Tercero, F., Lopez-Perez, J. A., de Vicente, P. |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | A&A 647, L2 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/202140434 |
| Popis: | We present the discovery in TMC-1 of vinyl acetylene, CH2CHCCH, and the detection, for the first time in a cold dark cloud, of HCCN, HC4N, and CH3CH2CN. A tentative detection of CH3CH2CCH is also reported. The column density of vinyl acetylene is (1.2 +/- 0.2)e13 cm-2, 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, CH3CHCH2. The column densities derived for HCCN and HC4N are (4.4 +/- 0.4)e11 cm-2 and (3.7 +/- 0.4)e11 cm-2, respectively. Hence, the HCCN/HC4N abundance ratio is 1.2 +/- 0.3. For ethyl cyanide we derive a column density of (1.1 +/- 0.3)e11 cm-2. 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. Comment: Accepted for publication in A&a Letters |
| Databáze: | arXiv |
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