一个大质量恒星形成复合体的动力学性质

Dynamic Properties of a Massive Star Formation Complex

恒星形成于分子云之中,分子外向流是恒星形成正在进行的重要动力学特征,也是研究和认识恒星形成的重要契入点.利用紫金山天文台青海观测站德令哈13.7m毫米波望远镜,采用5种分子谱线探针(包括^(12)CO、^(13)CO、C^(18)O、HCO+J=1-0和CS J=2-1,J为角动量量子数),对一个包含IRAS 19230+1506、IRAS 19232+1504和G050.3179--00.4186这3个源的大质量恒星形成复合体进行了成图观测研究.通过对以上分子谱线数据并结合红外波段巡天数据的分析,在这3个源中首次探测到了分子外向流活动,并确定了分子外向流的中心驱动源.最后对这3个源进行了分子外向流相关物理量参数的计算,分析了这些物理量参数之间的关系,结果表明分子外向流的性质与中心驱动源的性质息息相关.

Stars are formed in molecular clouds.Molecular outflow is an important dynamic feature of star formation and an important entry point for the study and understanding of star formation.Using the 13.7 m millimeter wave telescope of Delingha,Qinghai Observation Station of Purple Mountain Observatory,we used five molecular line probes(including ^(12)CO,^(13)CO,C^(18)O,HCO^(+)J=1−0 and CS J=2−1,J is the quantum number of angular momentum).A massive star formation complex containing three sources IRAS 19230+1506,IRAS 19232+1504 and G050.3179–00.4186 were been mapped.Through the analysis of the above molecular spectral line data combined with infrared band sky survey data,we detected the molecular outflow activity for the first time in the three sources,and identified the central driver of the molecular outflow.Finally,the physical parameters related to the outflow is calculated for the three sources,and the relationship between these physical parameters is analyzed.The results show that the properties of the outflow is closely related to the properties of the central driving source.