CO observations of massive star forming regions at different evolutionary phases |
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| Authors: | CHEN Xi XU Ye SHEN Zhiqiang LI Jingjing |
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| Institution: | 1. Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;Graduate School of the Chinese Academy of Sciences,Beijing 100034,China
2. Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;Joint Institute for Galaxy and Cosmology,Shanghai Astronomical Observatory and the University of Science and Technology of China,Shanghai 200030,China |
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| Abstract: | The 12CO (J=1-0), 13CO (J=1-0) and C18O (J=1-0) emissions in 9 massive star forming regions, which are believed to be at different stages of massive star formation,
were mapped with the 13.7 m millimeter wave telescope at Qinghai Station of Purple Mountain Observatory. Of the observed 9
sources, 13CO cores were detected in seven of them, and C18O cores in five of them. And only two sources associated with C18O cores and H2O masers showed the extended structures and strong outflows. This is the first detection of outflow associated with IRAS 22566+5828
in the observing field of S152/S153. The physical parameters of cores and outflows for these sources, derived from Local Thermal
Equilibrium (LTE) analysis, are presented. These observing results suggest that the C18O cores will only appear when the gas density is high enough and the probability to have an outflow is very high when the
clumps show the C18O and H2O maser simultaneously. |
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| Keywords: | star formation cloud core outflow H2O maser |
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