| Evidence of Evolution in the Dense Cores in Massive Star Forming Regions |
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| 引用本文： | Jarken Esimbek. Evidence of Evolution in the Dense Cores in Massive Star Forming Regions[J]. 中国天文和天体物理学报, 2005, 5(4): 363-370 |
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| 作者姓名： | Jarken Esimbek |
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| 作者单位： | National Astronomical |
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| 基金项目： | Supported by the National Natural Science Foundation of China. |
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| 摘 要： | The excitation of H2O masers usually needs very high density gas, hence it can serve as a marker of dense gas in HII region. We selected a sample of H2O maser sources from Plume et al. (four with, and four without detected CS(J = 7-6) emission), and observed them in 13CO(J=1-0) and C18O (J=1-0). C18O (J=1-0) emission was detected only in three of the sources with detected CS(J=7-6) emission. An analysis combined with some data in the literature suggests that these dense cores may be located at different evolutionary stages. Multi-line observation study may provide us clues on the evolution of massive star forming regions and the massive stars themselves.
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| 关 键 词： | 星云 星际物质 天文物理学 散射 |
Evidence of Evolution in the Dense Cores in Massive Star Forming Regions |
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| Jian-Jun Zhou Jarken Esimbek Ji-Xian Sun Bing-Gang Ju Jing-Jiang Sun. Evidence of Evolution in the Dense Cores in Massive Star Forming Regions[J]. Chinese Journal of Astronomy and Astrophysics, 2005, 5(4): 363-370 |
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| Authors: | Jian-Jun Zhou Jarken Esimbek Ji-Xian Sun Bing-Gang Ju Jing-Jiang Sun |
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| Affiliation: | [1]National Astronomical Observatories/Urumqi observatory, Chinese Academy of Sciences,Urumqi 830011 [2]Graduate School of the Chinese Academy of Science, Beijing 100080 [3]Qinghai Station of Purple mountain Observatory, Chinese Academy of Science, Delingha,Qinghai 817000 |
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| Abstract: | The excitation of H2O masers usually needs very high density gas, hence it can serve as a marker of dense gas in HII region. We selected a sample of H2O maser sources from Plume et al. (four with, and four without detected CS(J = 7-6) emission), and observed them in 13CO(J=1-0) and C18O (J=1-0). C18O (J=1-0) emission was detected only in three of the sources with detected CS(J=7-6) emission. An analysis combined with some data in the literature suggests that these dense cores may be located at different evolutionary stages. Multi-line observation study may provide us clues on the evolution of massive star forming regions and the massive stars themselves. |
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| Keywords: | ISM: molecules - masers - radio lines: ISM-stars: formation |
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