W31分子云C^(18)O(J=1-0)的新观测

The New Observation of C^(18)O(J=1-0) MolecularEmission in W31

利用紫金山天文台青海站的13.7 m射电望远镜首次对W31分子云西北部区域中不同速度成份的分子云进行了C18O(J=1-0)的成图观测与研究,观测范围为16’×25’,观测波束间隔为1’.对不同视向速度的分子云分开进行处理,在成图范围内新观测到3个C18O分子云团块,发现它们均属于较年轻的稳定分子云.根据谱线辐射温度(TR*)和半宽(△V),利用LTE方法计算了每个被测团块的物理参数,讨论了该区域的团块分布、HIl区、脉泽源与恒星形成的关系.

We present the first C18O (J=1-0) mapping observations and studies for the northwest W31 molecular cloud at different velocity components. The observations were made in 2002 with the 13.7m-millimeter wave telescope of Purple Mountain Observatory. The observed area is 16' × 25' , the grid spacing of maps is 1'. Molecular Clouds with different velocities of line of sight were analyzed separately. Three new compact molecular clumps were discovered and we can find that they are young and stable molecular clumps According to the line radiation temperature(TR*) and the line half width(△V), the physical parameters for these clumps were derived with LTE method. Besides, the relationships between the distributions of these clumps, HⅡ regions,masers and star formation are also discussed.