C_2H, HC_3N and HNC observations in OMC-2/3

For the first time, the OMC-2/3 region was mapped in C2H （1–0）, HC3N （10–9） and HNC （1–0） lines. In general, the emissions from all the three molecular species reveal an extended filamentary structure. The distribution of C2H cores almost follows that of the 1300μm condensations, which might suggest...

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Bibliographic Details
Published in:天文和天体物理学研究：英文版 2011, Vol.11 (6), p.671-678
Main Author: Qiang Liu Ji Yang Yan Sun Ye Xu
Format: Article
Language:English
Subjects:
HNC
OMC
分子云
排放量
核心群
紫外线辐射
结构
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Summary:For the first time, the OMC-2/3 region was mapped in C2H （1–0）, HC3N （10–9） and HNC （1–0） lines. In general, the emissions from all the three molecular species reveal an extended filamentary structure. The distribution of C2H cores almost follows that of the 1300μm condensations, which might suggest that C2H is a good tracer to study the core structure of molecular clouds. The core masses traced by HNC are rather ？at, ranging from 18.8 to 49.5 M , while also presenting a large span for those from C2H, ranging from 6.4 to 36.0 M . The line widths of both HNC and C2H look very similar, and both are wider than that of HC3N. The line widths of the three lines are all wider than those from dark clouds, implying that the former is more active than the latter, and has larger turbulence caused by winds and UV radiation from the surrounding massive stars.
ISSN:1674-4527
2397-6209