论文标题
通过Quijote Line调查发现C5H+和C3H+的检测
Discovery of C5H+ and detection of C3H+ in TMC-1 with the QUIJOTE line survey
论文作者
论文摘要
我们通过Quijote系调查报告了C5H+阳离子朝向TMC-1的发现。从j = 7-6到j = 10-9的四条线以完美的谐波频率关系确定，可以与B = 2411.94397 +/- 0.00055 MHz拟合，并且D = 138 +/- 3 Hz。拟合的标准偏差为4.4 kHz。在丢弃了潜在候选者之后，C5H- - 我们得出结论，载体是C5H+，因此，准确的依次计算提供了B = 2410.3 MHz。我们还首次以冷的无星核报告了C3H+阳离子的检测。我们得出C5H+和C3H+的列密度分别为（8.8 +/- 0.5）E10 CM-2和（2.4 +/- 0.2）E10 CM-2。因此，C5H+/C3H+丰度比为3.7 +/- 0.5。 C5H+比C3H+更丰富的事实是由专用化学模型很好地解释的，这是由于C5H+与H2的反应性缓慢，而C3H+与H2反应。
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.
