空间RNA世界的前体：在星际介质中检测（$Z$）-1，2-乙烯基噻吩，糖形成的关键中间体
Precursors of the RNA-world in space: Detection of ($Z$)-1,2-ethenediol in the interstellar medium, a key intermediate in sugar formation
摘要：
我们首次在位于银河系中心的G+0.693-0.027分子云的星际介质中探测到了（$Z$）-1，2-乙烯醇，（CHOH）$_2$，乙醇醛的烯醇形式。我们推导出柱密度为（1.8 $\pm$ 0.1）$\times$ 10 $^{13}$ cm $^{-2}$，其转化为相对于分子氢的分子丰度为1.3 $\times$ 10 $^{-10}$。乙醇醛和（$Z$）-1，2-乙烯基吡咯烷酮之间的丰度比为$\sim$ 5.2。我们讨论了几种可行的形成途径，通过化学反应的前体，如HCO，H $_2$ CO，CHOH或CH $_2$ CHOH。我们还提出，这种物种可能是一个重要的前体在形成甘油醛（HOCH $_2$ CHOHCHO）在星际介质通过结合与羟基亚甲基（CHOH）自由基。
英文摘要：
We present the first detection of ($Z$)-1,2-ethenediol, (CHOH)$_2$, the enol form of glycolaldehyde, in the interstellar medium towards the G+0.693-0.027 molecular cloud located in the Galactic Center. We have derived a column density of (1.8$\pm$0.1)$\times$10$^{13}$ cm$^{-2}$, which translates into a molecular abundance with respect to molecular hydrogen of 1.3$\times$10$^{-10}$. The abundance ratio between glycolaldehyde and ($Z$)-1,2-ethenediol is $\sim$5.2. We discuss several viable formation routes through chemical reactions from precursors such as HCO, H$_2$CO, CHOH or CH$_2$CHOH. We also propose that this species might be an important precursor in the formation of glyceraldehyde (HOCH$_2$CHOHCHO) in the interstellar medium through combination with the hydroxymethylene (CHOH) radical.
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