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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  
【摘要】: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 8μm,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 morphology 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 of103L in 19 H II regions.In addition,we identify some young stellar objects(including Class I sources),which are only concentrated in H II regions G29.007+0.076,G44.339–0.827 and G47.028+0.232.The polycyclic 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 formation 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.

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