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We present Caltech Submillimeter Observatory CO (2-1) and Spitzer IRAC observations toward IRAS 22506+5944,which is a 104 L☉ massive star-forming region.The CO (2-1) maps show an east-west bipolar molecular outflow originating from the 3 mm dust continuum peak.The Spitzer IRAC color-composite image reveals a pair of bow-shaped tips which are prominent in excess 4.5 μm emission and are located at the leading fronts of the bipolar outflow,providing compelling evidence for the existence of bow-shocks as the driving agents of the molecular outflow.By comparing our CO (2-1) observations with previously published CO (1-0) data,we find that the CO (2-1)/(1-0) line ratio increases from low (~5 km s-1) to moderate (~8-12km s-1) velocities,and then decreases at higher velocities.This is qualitatively consistent with the scenario that the molecular outflow is driven by multiple bow-shocks.We also revisit the position-velocity diagram of the CO (1-0) data,and find two spur structures along the outflow axis,which are further evidence for the presence of multiple jet bowshocks.Finally,power-law fittings to the mass spectrum of the outflow gives power law indexes more consistent with the jet bow-shock model than the wide-angle wind model.
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来源期刊 天文和天体物理学研究 学科
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年,卷(期) 2018,(2) 所属期刊栏目
研究方向 页码范围 73-82
页数 10页 分类号
字数 语种 英文
DOI 10.1088/1674-4527/18/2/19
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天文和天体物理学研究
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1674-4527
11-5721/P
北京朝阳区大屯路甲20号国家天文台 RAA编辑部
eng
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