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arXiv 2010.04419astro-ph.GA
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空间HC3O +的发现:TMC-1中含氧物质的化学性质

Discovery of HC3O+ in space: The chemistry of O-bearing species in TMC-1

J. Cernicharo, N. Marcelino, M. Agundez, Y. Endo, C. Cabezas, C. Bermudez, B. Tercero, P. de Vicente

摘要:

使用Yebes 40米和IRAM 30米射电望远镜,我们探测到一系列谐波相关的线,旋转常数B 0 =4460.590 +/- 0.001 MHz,失真常数D 0 =0.511 +/- 0.005 kHz,朝向冷密核TMC-1。高水平的理论从头计算表明,最好的可能的候选者是质子化的一氧化三碳,HC 3 O+。我们已经在实验室中成功地制备了该物种,并观察到了它的J = 2-1和3-2转动跃迁。因此,我们报告的发现HC 3 O+在空间的基础上,我们的观察,理论计算和实验室实验。我们推导出丰度比N(C3 O)/N(HC 3 O+)= 7。质子化形式的C3 O的高丰度是由于中性物质的高质子亲和力。含氧物种的化学建模,预测相比,从我们的数据中最突出的含氧物种TMC-1的衍生丰度。

英文摘要:

Using the Yebes 40m and IRAM 30m radio telescopes, we detected a series of harmonically related lines with a rotational constant B0=4460.590 +/- 0.001 MHz and a distortion constant D0=0.511 +/- 0.005 kHz towards the cold dense core TMC-1. High-level-of-theory ab initio calculations indicate that the best possible candidate is protonated tricarbon monoxide, HC3O+. We have succeeded in producing this species in the laboratory and observed its J = 2-1 and 3-2 rotational transitions. Hence, we report the discovery of HC3O+ in space based on our observations, theoretical calculations, and laboratory experiments. We derive an abundance ratio N(C3O)/N(HC3O+) = 7. The high abundance of the protonated form of C3O is due to the high proton affinity of the neutral species. The chemistry of O-bearing species is modelled, and predictions are compared to the derived abundances from our data for the most prominent O-bearing species in TMC-1.

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