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《天文和天体物理学研究(英文版)》 2014-01
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Multi-wavelength study of triggered star formation around 25 H II regions

Jin-Long Xu;Jun-Jie Wang;Chang-Chun Ning;Chuan-Peng Zhang;National Astronomical Observatories,Chinese Academy of Sciences;NAOC-TU Joint Center for Astrophysics;Tibet University;University of Chinese Academy of Sciences;  
We investigate 25 H II regions that show bubble morphology in13CO(1–0) and infrared data, to search for quantitative evidence of triggered star formation by processes described by the collect and collapse(CC) and radiatively driven implosion(RDI) models. These H II regions display the morphology of a complete or partial bubble at 8 μm, and are all associated with the molecular clouds that surround them. We found that the electron temperature ranges from 5627 K to 6839 K in these H II regions, and the average electron temperature is 6083 K. The age of these H II regions is from 3.0×105yr to 1.7×106yr, and the mean age is 7.7×105yr. Based on the mor- phology of the associated molecular clouds, we divide these H II regions into three groups, which may support CC and RDI models. We select 23 young IRAS sources which have an infrared luminosity of 103L in 19 H II regions. In addition, we iden- tify some young stellar objects(including Class I sources), which are only concen- trated in H II regions G29.007+0.076, G44.339–0.827 and G47.028+0.232. The poly- cyclic aromatic hydrocarbon emissions of the three H II regions all show a cometary globule. Comparing the age of each H II region with the characteristic timescales for star formation, we suggest that the three H II regions can trigger clustered star forma- tion by an RDI process. In addition, we detect seven molecular outflows in the five H II regions for the first time. These outflow sources may be triggered by the corresponding H II regions.
【Fund】: Supported by the National Natural Science Foundation of China
【CateGory Index】: P144
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