中国物理B ›› 2005, Vol. 14 ›› Issue (4): 863-868.doi: 10.1088/1009-1963/14/4/040
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周武飞1, 吴月芳1, 魏悦1, 巨秉刚2
Zhou Wu-Fei (周武飞)a, Wu Yue-Fang (吴月芳)a, Wei Yue (魏悦)a, Ju Bing-Gang (巨秉刚)b
摘要: We have mapped 23 sources in the $J$=1--0 lines of 12CO, 13CO and C18O with the 13.7-m telescope at Qinghai station of Purple Mountain Observatory.The samples were chosen from the massive star formation regions whose single point lines have the broad-wing profile. The mapping shows that 12 clouds have cores and 5 outflows were identified with the 12CO CO $J$=1--0 lines. Among the 12 cores, systematic velocity shifts were found in 2 cores, and blue asymmetric double-peak profile of 12CO line was found in IRAS 19529+2704, indicating that it may be an infall candidate. Physical parameters of the cores and outflows were derived from the local thermodynamic equilibrium assumption.The masses range from $\sim 9.4\times 102M_{ \odot }$ to $\sim 2.2\times 105M_{ \odot }$. The hydrogen molecule densities range from $\sim 3.4\times 102{\rm cm}-3 to $\sim 1.2\times 104{\rm cm}-3. The molecular outflows have masses larger than 3.5$M_{ \odot }$, and kinetic energies greater than 0.9$\times 1038J. The outflows have significantly greater masses and kinetic energies than those from low-mass young stellar objects (YSOs). For the cores, 2MASS data are available, dozens of 2MASS sources with different colour indices and brightness are often found around IRAS source, among which the reddest 2MASS source is always within the IRAS error ellipse thus probably corresponds to the IRAS source.
中图分类号: (Star formation)