星际HCCSH和H $_2$ CCS
Searches for Interstellar HCCSH and H$_2$CCS
摘要：
天体化学中一个长期存在的问题是许多现有模型无法解释硫含量的缺失。许多相对简单的物种，可能是很好的候选人螯合硫尚未进行实验测量，在高光谱分辨率所必需的射电天文学识别。在新的实验室数据的基础上，我们报告了含硫烃HCCSH在微波、毫米和亚毫米波段的旋转谱线的搜索。由于沿其$b$ -惯性轴的大偶极矩，而且由于两个高度丰富的天文碎片（CCH和SH自由基）之间的双分子反应可能很快，这种简单的物质似乎是在空间探测的有希望的候选者。然而，对从厘米到远红外线的多条线调查的检查，从乌云到高质量恒星形成区的一系列来源，导致未检测到。一个类似的搜索最低能量的异构体，H $_2$ CCS，提出了比较，也导致在非检测。两种物质相对于氢的丰度的典型上限为$10^{-9}$ - $10^{-10}$。因此，我们的结论是，无论是异构体是一个主要的水库星际硫在研究的环境范围内。这两个物种可能仍然是可行的候选人检测在其他环境中或在更高的频率，提供实验室频率可用。
英文摘要：
A long standing problem in astrochemistry is the inability of many current models to account for missing sulfur content. Many relatively simple species that may be good candidates to sequester sulfur have not been measured experimentally at the high spectral resolution necessary to enable radioastronomical identification. On the basis of new laboratory data, we report searches for the rotational lines in the microwave, millimeter, and sub-millimeter regions of the sulfur-containing hydrocarbon HCCSH. This simple species would appear to be a promising candidate for detection in space owing to the large dipole moment along its $b$-inertial axis, and because the bimolecular reaction between two highly abundant astronomical fragments (CCH and SH radicals) may be rapid. An inspection of multiple line surveys from the centimeter to the far-infrared toward a range of sources from dark clouds to high-mass star-forming regions, however, resulted in non-detections. An analogous search for the lowest-energy isomer, H$_2$CCS, is presented for comparison, and also resulted in non-detections. Typical upper limits on the abundance of both species relative to hydrogen are $10^{-9}$-$10^{-10}$. We thus conclude that neither isomer is a major reservoir of interstellar sulfur in the range of environments studied. Both species may still be viable candidates for detection in other environments or at higher frequencies, providing laboratory frequencies are available.
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