摘要
在典型的视超光速源3C345中有两个射电节点C_4和C_5,沿着不同的弯曲轨道运动,并且在靠近核心处它们的运动出现加速.本文对这些观测到的运动特性提出一种解释.我们假定视超光速节点是沿着喷流内的螺旋形磁力线运动的.在简化的几何学考虑和小视角观测的情况下,用适当形式的螺旋磁场和空间速度,对节点C_4和C_5的视轨道和视运动速度可得到很好的拟合.
In the superluminal radio source 3C345 it was observed that there are two inner knots (C_4 and C_5), which moved along different curved trajectories and showed accelerated motions when they were close to the core. In his paper we liscuss their kinematics under the supposition that the knots move along helical magnetic field lines around the jet-axis as thtir common axis. It is shown that for a simplified geometry suitable patterns of the helical trajectories and spatial velocities can be chosen to fit both the apparent trajectories and apparent velocities for knots C_4 and C_5 quite well. The physical implications of the results are discussed.
出处
《天文学报》
CSCD
北大核心
1991年第4期369-379,共11页
Acta Astronomica Sinica
关键词
河外
射电源
类星体
视超光速源
Quasar-Extragalactic radio sources-Superluminal motion
