大质量分子云核的CO同位素搜寻  

Searches for Massive Molecular Cloud Cores with CO Isotopes

作　　者：吴月芳[1] 吴京文[1] 王均智[1] 阎慧荣[1] 雷成明[2] 孙金江[2] 王利明 

机构地区：[1]北京大学地球物理系中科院-北大联合北京天体物理中心,北京100871 [2]中国科学院紫金山天文台青海观测站,德令哈817000

出　　处：《天体物理学报》2000年第4期383-388,共6页

基　　金：国家自然科学基金

摘　　要：使用紫金山天文台 １３．７ ｍ望远镜上新安装的 ＳＩＳ系统，对 ６４个高色指数 ＩＲＡＳ源和水脉泽源进行了 ＣＯ同位素１３ＣＯ和 Ｃ１８Ｏ Ｊ＝ １－０的搜寻，并对部分源作了成图观测．结果在 ６４个源中全部测到了这一谱线对，而１３ＣＯ的辐射一般较强，说明与稠密分子区成协，其中约６０个源为首次作ＣＯ同位素谱线对巡测．用高斯拟会导出了天线温度、线心速度和谱线全半宽．对辐射强度、话线特征进行了初步分析．Using the newly installed SIS receiving system of the 13.7m telescope of PMO, CO isotopes 13CO J = 1 - 0 were observed in a search for dense cores in 64 IRAS sources with high color indices or H2O masers. Maps were obtained for some of the sources. The line pair was detected in all the target sources. The emission of 13CO J = 1 - 0 is strong showing that the emission regions are dense. The pair lines of the CO isotopes were measured for the first time in at least 60 sources. Antenna temperatures, center velocities and line widths are obtained with Gaussian fitting. Preliminary analyses were made for the emission intensities and line profiles.

关 键 词：星际分子 恒星 CO同位素 分子云核 

分 类 号：P152[天文地球—天文学]