【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 3×10⁴ 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 3×10¹3K,氢分子数密度为 8×10¹4m^-3,微波激射辐射两能级之间的布居反转粒子数密度为 5×10⁵（H₂O）m^-3.从Orion KL分子云水微波激射辐射谱的对称结构分析,宁静相水微波激射区处于对称外流或膨胀的动力学结构状态更多还原

【Abstract】 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.更多还原