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Effect of Optical Depth on Study of Chemical Properties of Massive Star Forming Clumps
Jian-jun Zhou1,2, Run-xia Li*1,3, Donghui Quan1,4, Jarken Esimbek1,2, Yu-xin He1,2, Da-lei Li1,2, Xin-di Tang1,2, Gang Wu1,2, Wei-guang Ji1,2, Zheng-xue Chang1,3, Xia Zhang1,3
1.Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China;2.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi 830011, China;3.University of the Chinese Academy of Sciences, Beijing 100080, China;4.Department of Chemistry, Eastern Kentucky University, Richmond KY 40475, USA
Abstract:
Here we present the study on chemical properties of massive star forming clumps using N2H+(1-0), H13CO+(1-0), HCN(1-0) and HN13C(1-0)) data from the literature [Astron. As-trophys. 563, A97 (2014)]. We found that abundances of H13CO+ and HN13C are a ected by H2 column densities. As the median values of these two abundances increase by nearly 10 times from stages A to B, H13CO+ and HN13C are suitable for tracing the evolution of massive star forming clumps. The order of rapidity in growth of abundances of all the four studied molecules from stages A to B, is H13CO+, HCN, HN13C, and N2H+, from the highest to the lowest. Our results suggest that the observing optically thin molecular lines with high angular resolution are necessary to study the chemical evolution of massive star forming clumps.
Key words:  Stars formation, Clumps, Molecules, Radio lines
FundProject:
光深对大质量恒星形成团块化学性质研究的影响
周建军1,2, 李润霞*1,3, 全冬晖1,4, 加尔肯? 叶生别克1,2, 何玉新1,2, 李大磊1,2, 汤新弟1,2, 吴 刚1,2, 纪伟光1,2, 常正雪1,3, 张 霞1,3
1.中国科学院新疆天文台,乌鲁木齐 830011;2.中国科学院射电重点实验室,乌鲁木齐 830011;3.中国科学院大学,北京 100049;4.美国东肯塔基大学化学系,里士满 KY 40475
摘要:
本文使用文献中的N2H+(1-0)、H13CO+(1-0)、HCN(1-0)和HN13C(1-0)谱线数据研究大质量恒星形成团块的化学性质和演化,发现H13CO+和HN13C的丰度受H2柱密度的影响. 由于从A阶段到B阶段这两个丰度的中值增加了近10倍,H13CO+和HN13C适合追踪大质量恒星形成团块的演化. 从A到B阶段四种分子丰度增长速度从高到低依次为H13CO+、HCN、HN13C、N2H+. 结果表明进行光学薄分子谱线的高分辨率观测对于研究大质量恒星形成团块的化学演化是必要的.
关键词:  恒星形成,团块,分子射电谱线
DOI:10.1063/1674-0068/cjcp1911212
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