年轻星天体喷流的近红外成像观测进展

年轻星天体喷流的近红外成像观测进展

江治波;杨戟

【期刊名称】《天文学进展》 【年(卷),期】2000(018)004

【摘要】The infrared ro-vibrational lines of molecular hydrogen are the most important tracers of rn rnmass outflow around young stellar objects (YSOs). Since the first discovery by Gautier et al.in 1976, the molecular hydrogen lines have been detected in almost all star forming regions in the Galaxy over the subsequent decades. Further studies show that H2 line emissions are closely associated with other energetic activities around YSOs such as molecular outflows and optical jets. Infrared and optical jets are two different manifestations of the same jet interaction with ambient media. Such interaction leads to the entrainment of ambient material and subsequently drives molecular outflow. Optical/infrared jets and molecular outflows make up the spectacular scenery in the star forming regions and are the signposts of star forming activities.rn With the advent of the large array detector such as NICMOS in the 1990's, great progress has been made in near infrared imaging observation. So far about 70 regions have been detected in H2 emission, with the number increasing rapidly. Future development will be in two directions: observation at higher angular resolution should reveal the detailed structure of H2 jets, which will also