Synthesis imaging of the DR 21 (OH) cluster. II: Thermal ammonia and water maser emission
Synthesis imaging of the DR 21 (OH) cluster. II: Thermal ammonia and water maser emission
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DOI：
10.1086/171167
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发表时间：
1992-04
期刊：
影响因子：
--
通讯作者：
J. Mangum;A. Wootten;L. Mundy
中科院分区：
文献类型：
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作者：
J. Mangum;A. Wootten;L. Mundy
对DR 21 （OH）分子云进行了高灵敏度、4″分辨率的热氨和水微波激射成像。nh3（1,1）和（2,2）跃迁的图像显示了四个主要的发射区域嵌入在一个块状的发射分布中。在这些图像中共识别出18个氨核。对这些地核物理性质的分析表明，它们质量大（15-1000 μ M⊙），温度高（20 -大于80 μ k），尺寸范围为（θ s⇒0.06-0.28 pc）。
High-sensitivity, 4″ resolution images of the thermal ammonia and water maser emission have been made of the DR 21 (OH) molecular cloud. Images of the NH 3 (1,1) and (2,2) transitions show four primary emission regions embedded in a generally clumpy emission distribution. A total 18 ammonia cores are identified in these images. An analysis of the physical properties of these cores has shown that they are massive (M G ⇒15-1000 M ⊙ ) and warm (T k ⇒20 to greater than 80 K) with a range of sizes (θ s ⇒0.06-0.28 pc).