论文标题
通过Quijote Line调查发现CH2CCHC4H和对TMC-1中CH2CCHC3N的严格检测
Discovery of CH2CCHC4H and a rigorous detection of CH2CCHC3N in TMC-1 with the QUIJOTE line survey
论文作者
论文摘要
使用在32.0-50.4 GHz范围内的Quijote线调查，我们报告了分子CH2CCHC4H朝Taurus地区的Prestellar冷核TMC-1发现的发现。我们还对CH2CCHC3N进行了严格的检测以及其详细的分析。我们确定了这些分子中的每个分子的总共二十个旋转过渡。旋转量子数的范围从JU = 17到24，Ka <= 3。 CH2CCHC4H的色谱柱密度为n =（2.2 +/- 0.2）x 1E12 cm-2，而对于CH2CCHC3N，我们得出n =（1.2 +/- 0.15）x 1e11 cm-2。这两种物种的旋转温度为9.0 +/- 0.5 k。 CH2CCHC4H和CH2CCHC3N之间的丰度比为18 +/- 4。我们还将这些物种的色谱柱密度与它们的异构体CH3C6H和CH3C5N的柱密度进行了比较，这些物种的J = 20-19至j = 30-29旋转过渡，并在Quijote Line调查中观察到。 TMC-1的最先进的化学模型可以很好地解释所有这些物种的观察到的丰度。观察到的天文频率与文献中的实验室频率合并，以得出改善的光谱参数。
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.
