摘要
本文对具有活动晕和固定晕的盘状星系在碰撞中的不同动力学效应作了讨论.在N—体数值模拟中用了52000个粒子,目标系统是一个真实的盘和一个活动晕组成的三维自洽系统,窜入星系是一个固定的Plummer势,沿着目标星系盘平面并穿过其中心的一条直线作匀速直线运动.在目标星系的晕固定的情况下,其他条件与在活动晕时完全一样作了另一个对比性试验.对活动晕和固定晕目标星系受碰后的形态和动力学反应作了比较.结论中认为:三轴椭球状的晕对于非轴对称的盘状星系的扭矩,以及棒状旋涡星系受到的来自晕的动力学摩擦的长期动力学效应是值得进一步研究的.
The differences between the dynamical effects of spirals with live and rigid haloes in interacting have been discussed. For the live halo case, the simulation is an N-body approach using 52000 particles. The target system is a realistic disk with a live halo. The intruder is a rigid body of Plummer potential, moving along a rectilinear orbit in the disk plane and passing through the target centre with a constant velocity. With the same other conditions, an experiment with target system of rigid halo has been performed. The morphological and dynamical differences have been discussed for live and rigid halo cases. In the conclusion, the author suggests that the long term effects of the torque on non-axial symmetric spirals exerted by triaxial haloes and the torque of dynamical friction on fast rotating bars by haloes should not be neglected.
出处
《天文学报》
CSCD
北大核心
1989年第1期1-13,共13页
Acta Astronomica Sinica
