标题： Q波段线谱观测 toward 一个富含碳链的团块 in Serpens South 区域 显示英文标题

标题： Q-band Line Survey Observations toward a Carbon-chain-rich Clump in the Serpens South Region

摘要： 我们使用安装在野边山45米射电望远镜上的扩展Q波段（eQ）接收器，对蛇夫座南星团形成区域中的碳链发射峰进行了Q波段（30 GHz $-$ 50 GHz）线调查观测。 大约检测到了180条谱线，包括暂定检测，这些谱线被归因于52种分子，包括同位素异构体。 发现该位置富含碳链物种，与猎户座分子云-1（TMC-1 CP）中的氰化多炔峰相当，表明化学上较为年轻。 不仅检测到了碳链物种，还检测到了几种复杂的有机分子（CH$_3$OH，CH$_3$CHO，HCCCHO，CH$_3$CN，以及暂定检测的C$_2$H$_3$CN），这与演化前星云核中发现的化学复杂性相似。 HDCS/H$_2$CS比率被推导为$11.3 \pm 0.5$%，这个值与前恒星核心L1544相似。 化学上年轻的特征与密度较低的暗星核TMC-1 CP ($10^4$ cm$^{-3}$ $-$ $10^5$ cm$^{-3}$)相似，以及化学上演化的特征与致密的预恒星核心L1544 ($\sim 10^6$ cm$^{-3}$)相似，这意味着包含观测位置的云团是一个没有当前恒星形成活动的前星团云团。 显示英文摘要

摘要： We have conducted Q-band (30 GHz $-$ 50 GHz) line survey observations toward a carbon-chain emission peak in the Serpens South cluster-forming region with the extended Q-band (eQ) receiver installed on the Nobeyama 45 m radio telescope. Approximately 180 lines have been detected including tentative detection, and these lines are attributed to 52 molecules including isotopologues. It has been found that this position is rich in carbon-chain species as much as Cyanopolyyne Peak in Taurus Molecular Cloud-1 (TMC-1 CP), suggesting chemical youth. Not only carbon-chain species, but several complex organic molecules (CH$_3$OH, CH$_3$CHO, HCCCHO, CH$_3$CN, and tentatively C$_2$H$_3$CN) have also been detected, which is similar to the chemical complexity found in evolved prestellar cores. The HDCS/H$_2$CS ratio has been derived to be $11.3 \pm 0.5$ %, and this value is similar to the prestellar core L1544. The chemically young features that are similar to the less-dense starless core TMC-1 CP ($10^4$ cm$^{-3}$ $-$ $10^5$ cm$^{-3}$) and chemically evolved characters which resemble the dense prestellar core L1544 ($\sim 10^6$ cm$^{-3}$) mean that the clump including the observed position is a pre-cluster clump without any current star formation activity.