Orion KL超水微波激射辐射的“宁静相”物理特征  

PHYSICAL PROPERTIES OF THE ORION KL SUPER WATER MASER IN “QUIESCENT” PHASE

作　　者：郑兴武[1] 凌兆芬[1] 吕静[2] 韩溥[2] 

机构地区：[1]南京大学天文系,南京210008 [2]紫金山天文台,南京210008

出　　处：《物理学报》1996年第8期1418-1424,共7页Acta Physica Sinica

基　　金：国家自然科学基金;国家攀登计划资助的课题

摘　　要：利用紫金山天文台青海观测站的 13.7 m的射电望远镜,观测 Orion KL分子云的水微波激射辐射发现这个区的微波激射活动处于”宁静”状态,峰值流量为 3×10~4 Jy,大约比爆发相微波激射辐射低两个数量级宁静水微波激射处于完全饱和的辐射过程,微波激射活动区的亮温度为 3×10~13K,氢分子数密度为 8×10~14m^-3,微波激射辐射两能级之间的布居反转粒子数密度为 5×10~5(H_2O)m^-3.从Orion KL分子云水微波激射辐射谱的对称结构分析。The observations of the water vapor maser emission toward the Orion - KL nebala have been carried out with the 13.7 m radio telascope at Delingha station of Purple Mountain Observatory. The maser emission is characterized by the 'quiescent phase' with the peak flux density 3 × 104 Jy, two orders lower than that during the 'outburst phase'. The maser action in the 'quiescent phase' is full saturated with the quiescent level of brightness temperature 3 × 1013 K. On the assumption of spherical maser and the saturated state, the hydrogen density of 8 × 1014(H2)m-3 and the population inversion of 5 × 105(H2O)m-3 in the masing region are derived.The Orion super water vapor maser spectrum consists of emission in three symmetric velocity intervals centered at the velocity 10 km·s-1. This may imply that there are symmetric outflows or expanding shells with constant velocities in the masing region.

关 键 词：超水微波 激射辐射 分子云 辐射谱 

分 类 号：P155[天文地球—天文学] P161