Submillimeter and far-infrared line observations of M17 SW - A clumpy molecular cloud penetrated by ultraviolet radiation
Submillimeter and far-infrared line observations of M17 SW - A clumpy molecular cloud penetrated by ultraviolet radiation
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DOI：
10.1086/166663
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发表时间：
1988-09
期刊：
影响因子：
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通讯作者：
J. Stutzki;G. Stacey;R. Genzel;A. Harris;D. Jaffe;J. Lugten
中科院分区：
文献类型：
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作者：
J. Stutzki;G. Stacey;R. Genzel;A. Harris;D. Jaffe;J. Lugten
毫米，亚毫米，远红外光谱观测的M17 SW星星形成区域进行了讨论。结果要求界面附近的分子云是聚集的或非聚集的。因此，来自中央OB星团的远紫外辐射可以穿透到致密的分子云中，达到几个pc的深度，从而从致密的原子和分子团或片的光解表面产生明亮的扩展（CII）辐射。整个M17复杂分子云SW的扩展（CII）发射水平比暴露于太阳附近典型紫外辐射场的单个分子云界面的预期水平高20倍。这表明分子云作为一个整体被紫外线辐射穿透，并具有一种聚集或聚集的结构。M17分子云中的B星数量可能提供扩展（CII）发射所需的紫外辐射。或者，如果M17附近的星际辐射高于太阳附近，那么紫外线辐射可能是外部的。
Millimeter, submillimeter, and far infrared spectroscopic observations of the M17 SW star formation region are discussed. The results require the molecular cloud near the interface to be clumpy or filamentary. As a consequence, far ultraviolet radiation from the central OB stellar cluster can penetrate into the dense molecular cloud to a depth of several pc, thus creating bright and extended (CII) emission from the photodissociated surfaces of dense atomic and molecular clumps or sheets. The extended (CII) emission throughout the molecular cloud SW of the M17 complex has a level 20 times higher than expected from a single molecular cloud interface exposed to an ultraviolet radiation field typical of the solar neighborhood. This suggests that the molecular cloud as a whole is penetrated by ultraviolet radiation and has a clumpy or filamentary structure. The number of B stars expected to be embedded in the M17 molecular cloud probably can provide the UV radiation necessary for the extended (CII) emission. Alternatively, the UV radiation could be external, if the interstellar radiation in the vicinity of M17 is higher than in the solar neighborhood.