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arXiv 2201.02434astro-ph.GA
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通过QUIJOTE线路调查发现C5H +并检测TMC-1 +

Discovery of C5H+ and detection of C3H+ in TMC-1 with the QUIJOTE line survey

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

摘要:

我们报告的发现,C5 H+阳离子的TMC-1与QUIJOTE线调查。从J=7-6到J=10 ~(-9)的四条谱线都具有很好的谐波频率关系,其拟合频率为B=2411.94397 +/-0.00055MHz,D=138+/-3Hz。拟合的标准差为4.4 kHz。在丢弃潜在的候选者,C5 H-其中,我们得出结论,载波是C5 H+,精确的从头计算提供B=2410.3 MHz。我们还报告首次在一个寒冷的无星核心的C3 H+阳离子的检测。我们推导出C5 H+和C3 H+的柱密度分别为(8.8+/-0.5 10 cm-2)和(2.4+/-0.2 10 cm-2)。因此,C5 H +/C3 H+丰度比为3.7+/-0.5。C5 H+比C3 H+更丰富的事实可以通过专用的化学模型很好地解释,并且是由于C5 H+与H2的反应性缓慢,而C3 H+与H2反应。

英文摘要:

We report the discovery of the C5H+ cation toward TMC-1 with the QUIJOTE line survey. Four lines from J=7-6 up to J=10-9 have been identified in perfect harmonic frequency relation that can be fit with B=2411.94397 +/-0.00055 MHz and D=138+/-3 Hz. The standard deviation of the fit is 4.4 kHz. After discarding potential candidates, C5H- among them, we conclude that the carrier is C5H+, for which accurate ab initio calculations provide B=2410.3 MHz. We also report for the first time in a cold starless core the detection of the C3H+ cation. The column densities we derive for C5H+ and C3H+ are (8.8+/-0.5)e10 cm-2 and (2.4+/-0.2)e10 cm-2, respectively. Hence, the C5H+/C3H+ abundance ratio is 3.7+/-0.5. The fact that C5H+ is more abundant than C3H+ is well explained by dedicated chemical models and is due to the slow reactivity of C5H+ with H2, while C3H+ reacts with H2.

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