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Evidence of Evolution in the Dense Cores in Massive Star Forming Regions

Evidence of Evolution in the Dense Cores in Massive Star Forming Regions

作     者:Jian-Jun Zhou Jarken Esimbek Ji-Xian Sun Bing-Gang Ju Jing-Jiang Sun 

作者机构:National Astronomical Observatories/Urumqi observatory Chinese Academy of SciencesUrumqi 830011 Graduate School of the Chinese Academy of Science Beijing 100080 Qinghai Station of Purple mountain Observatory Chinese Academy of Science DelinghaQinghai 817000 

出 版 物:《Chinese Journal of Astronomy and Astrophysics》 (中国天文和天体物理学报(英文版))

年 卷 期:2005年第5卷第4期

页      面:363-370页

核心收录:

学科分类:07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基  金:Supported by the National Natural Science Foundation of China 

主  题:ISM: molecules   masers   radio lines: ISM stars: formation 

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 C^18O (J=1-0). C^18O (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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