Drama of HII regions: Clustered and Triggered Star Formation

摘要

In order to understand the star formation process under the influence of HIIregions, we have carried out extensive investigations to well selectedstar-forming regions which all have been profoundly affected by existingmassive O type stars. On the basis of multi-wavelength data from mid-infraredto millimeter collected using $Spitzer$, $Herschel$, and ground based radiotelescopes, the physical status of interstellar medium and star formation inthese regions have been revealed. In a relatively large infrared dust bubble,active star formation is undergoing and the shell is still expanding. Signs ofcompressed gas and triggered star formation have been tentatively detected in arelatively small bubble. The dense cores in the Rosette Molecular Complexdetected at 1.1 mm using SMA have been speculated to have a likely triggeredorigin according to their spatial distribution. Although some observationalresults have been obtained, more efforts are necessary to reach trustworthyconclusions.