Poster Presentation

Star formation around the expanding HII region Sh2-82

Jinlong Xu (NAOC)

Abstract: Star formation requires dense self-gravitating gas. The activity of ultraviolet (UV) radiation, stellar winds, and supernova remnant (SNR) can all compress or accumulate a pre-existing gas into a dense gas. The gas may become gravitational instabilities, then collapse into dense cores. Such three dynamic processes may trigger the formation of a new generation of stars. Using the Spitzer-IRAC 8 μm and GRS 13CO J=1-0 archival data, we have studied a large-scale infrared bubble centered at l=53.9◦ and b=0.2◦. H II regions G53.54-0.01, G53.64+0.24, and G54.09-0.06 are located on the bubble. Molecular observations in CO J=1-0, 13CO J=1-0 and C18O J=1-0 with the Purple Mountain Observation (PMO) 13.7 m radio telescope were used to investigate the detailed distribution of molecular material associated with HII region G53.54-0.01 (Sh2-82).