摘要
利用紫金山天文台青海观测站１３．７米的毫米波望远镜对７４个大质量年轻星体或候选体进行了 Ｃ～（１８）Ｏ（１－０）的谱线观测．在６３个源中观测到了Ｃ～（１８）Ｏ（１－０）发射，其中 ５７个天体第一次探测到Ｃ～（１８）Ｏ（１－０）谱线发射．艰据谱线辐射温度（ＴＲ＊）和半宽（△Ｖ），利用ＬＴＥ方法计算了每个测量源的 Ｃ～（１８）Ｏ（１－０）发射的光学厚度和 Ｃ～（１８）Ｏ分子的柱密度，讨论了１３ＣＯ（１－０）和Ｃ～（１８）Ｏ（１－０）的谱线强度比和积分强度比．
Observations of C18O(1-0) line emission toward 74 massive young stellar objects (YSOs) or its candidates were carried out by using the 13.7m millimeter wave telescope of Purple Mountain Observatory at the Qinghai Station. 63 observed objects show the C18O(1-0) emission.57 of them were first detected in C18O(1-0) lines. According to the line radiation temperature(TR) and the line half width( V), the C18 O(1-0) optical depths and C18O column densities were derived for all with LTE method. Besides, we discussed the line intensity ratio and integral intensity ratio for 13CO(1-0) and C18O(1-0).
出处
《天文学报》
CSCD
北大核心
2002年第1期33-40,共8页
Acta Astronomica Sinica
基金
国家自然科学基金
中国科学院射电天文联合实验室资助
