Far-infrared observations of shocked CO in Orion
Far-infrared observations of shocked CO in Orion
复制标题
猎户座中震惊的二氧化碳的远红外观测
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
W. Hansen
中科院分区：
文献类型：
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作者：
J. Storey;D. Watson;C. Townes;E. Haller;W. Hansen
在猎户座分子云中检测到 CO 的 J = 27-26 和 J = 30-29 跃迁。这些检测加上 J = 21-20 转变的改进测量，可以估计冲击材料的温度和密度以及 CO 的分数丰度。通过求解 J 小于或等于 50 的详细平衡方程，并将数据拟合到与早期 2 微米和 12 微米 H2 观测一致的双组分模型，结果表明，热 (2000 K) 组分的密度约为 1.0 x 10 到6th/cu cm，而较冷的成分则在 400-1000 K 范围内，密度高出 2-5 倍。大约 25% 的碳以 CO 的形式存在。还通过在多个位置观察 J = 21-20 转变来检查热 CO 的空间范围，发现它的分布与 H2 线类似。此外，对其他六个来源的 J = 21-20 和 J = 22-21 CO 排放量的搜索得出了比猎户线强度低 10 倍的 3 个标准偏差上限。
The J = 27-26 and J = 30-29 transitions of CO have been detected in the Orion molecular cloud. These detections, together with an improved measurement of the J = 21-20 transition, allow estimation of the temperature and density of the shocked material and the fractional abundance of CO. By solving the equations of detailed balance for J less than or equal to 50 and fitting the data to a two-component model consistent with earlier 2-micron and 12-micron H2 observations, it is shown that the hot (2000 K) component has a density of approximately 1.0 x 10 to the 6th/cu cm, while the cooler component lies in the range of 400-1000 K and is 2-5 times more dense. Approximately 25% of the carbon is in the form of CO. The spatial extent of the hot CO has also been examined by observing the J = 21-20 transition at a number of positions, and it is found to be distributed similarly to the H2 lines. In addition, a search for J = 21-20 and J = 22-21 CO emission from six other sources has resulted in 3-standard-deviation upper limits of a factor of 10 below the intensity of the Orion lines.