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arXiv 2206.08992astro-ph.GA
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通过QUIJOTE线路测量发现CH2CCHC4H并在TMC-1中严格检测CH2CCHC3N

Discovery of CH2CCHC4H and a rigorous detection of CH2CCHC3N in TMC-1 with the QUIJOTE line survey

R. Fuentetaja, C. Cabezas, M. Agundez, B. Tercero, N. Marcelino, J. R. Pardo, P. de Vicente, J. Cernicharo

备注：
Astronomy and Astrophysics, in press. arXiv admin note: text overlap with arXiv:2112.01130
发表信息：
A&A 663, L3 (2022)
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摘要：

使用QUIJOTE线调查在32.0-50.4 GHz的范围内，我们报告的发现分子CH 2CCHC 4 H对星前冷核TMC-1在金牛座地区。我们还提出了一个严格的检测CH 2CCHC 3 N，随着其详细的分析。我们为这些分子中的每一个确定了总共20个旋转跃迁。转动量子数的范围从Ju=17到24，Ka<=3。CH 2CCHC 4 H的柱密度为N=（2.2+/-0.2）x 1 E12 cm-2，而对于CH 2CCHC 3 N，我们推导出N=（1.2+/-0.15）x 1 E11 cm-2。这两个物种的转动温度为9.0+/-0.5 K。CH 2CCHC 4 H和CH 2CCHC 3 N之间的丰度比为18+/-4。我们还比较了这些物种的柱密度与它们的异构体CH 3C 6 H和CH 3C 5 N，来自它们的J=20-19高达J=30-29旋转跃迁观察到的QUIJOTE线调查。所有这些物种的观察到的丰度合理地解释了TMC-1的最先进的化学模型。观测到的天文频率与文献中的实验室频率合并，以获得改进的光谱参数。

英文摘要：

Using the QUIJOTE line survey in the 32.0-50.4 GHz range, we report the discovery of the molecule CH2CCHC4H towards the prestellar cold core TMC-1 in the Taurus region. We also present a rigorous detection of CH2CCHC3N, along with its detailed analysis. We identified a total of twenty rotational transitions for each one of these molecules. The rotational quantum numbers range from Ju=17 up to 24 and Ka<=3. The column density for CH2CCHC4H is N=(2.2+/-0.2)x 1E12 cm-2, while for CH2CCHC3N, we derived N=(1.2+/-0.15) x 1E11 cm-2. The rotational temperature is 9.0+/-0.5 K for both species. The abundance ratio between CH2CCHC4H and CH2CCHC3N is 18+/-4. We also compared the column densities of these species with those of their isomers CH3C6H and CH3C5N, derived from their J=20-19 up to J=30-29 rotational transitions observed with the QUIJOTE line survey. The observed abundances for all these species are reasonably well explained by state-of-the-art chemical models of TMC-1. The observed astronomical frequencies were merged with laboratory frequencies from the literature to derive improved spectroscopic parameters.

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