TMC-1，无星核心硫磺工厂：NCS、HCCS、H2CCS、H2CCCS和C4S的发现和C5S的检测
TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, H2CCS, H2CCCS, and C4S and detection of C5S
摘要：
我们首次在太空中探测到含硫物质NCS、HCCS、H2 CCS、H2 CCCS和C4 S。通过观察每个物种的几条线，发现这些分子朝向TMC-1。我们还报告检测C5 S的第一次在冷云通过观察五条线在31-50 GHz的范围。导出的柱密度为N（NCS）=（7.8 +/- 0.6）e11 cm-2，N（HCCS）=（6.8 +/- 0.6）e11 cm-2，N（H2CCS）=（7.8 +/- 0.8）e11 cm-2，N（H2CCCS）=（3.7 +/- 0.4）e11 cm-2，N（C4S）=（3.8 +/- 0.4）e10 cm-2，N（C5S）=（5.0 +/- 1.0）e10 cm-2。观测到的C3 S和C4 S之间的丰度比为340，也就是说，比CCS和C3 S的相应值大约大100倍。观测结果进行了比较与国家的最先进的化学模型，这是只有部分成功地再现所观察到的丰度。这些发现突出表明，需要改进处理含硫物种的化学网络。
英文摘要：
We report the detection of the sulfur-bearing species NCS, HCCS, H2CCS, H2CCCS, and C4S for the first time in space. These molecules were found towards TMC-1 through the observation of several lines for each species. We also report the detection of C5S for the first time in a cold cloud through the observation of five lines in the 31-50 GHz range. The derived column densities are N(NCS) = (7.8 +/- 0.6)e11 cm-2, N(HCCS) = (6.8 +/- 0.6)e11 cm-2, N(H2CCS) = (7.8 +/- 0.8)e11 cm-2, N(H2CCCS) = (3.7 +/- 0.4)e11 cm-2, N(C4S) = (3.8 +/- 0.4)e10 cm-2, and N(C5S) = (5.0 +/- 1.0)e10 cm-2. The observed abundance ratio between C3S and C4S is 340, that is to say a factor of approximately one hundred larger than the corresponding value for CCS and C3S. The observational results are compared with a state-of-the-art chemical model, which is only partially successful in reproducing the observed abundances. These detections underline the need to improve chemical networks dealing with S-bearing species.
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