论文标题
通过放大，在银河螺旋臂中连贯的恒星运动
Coherent Stellar Motion in Galactic Spiral Arms by Swing Amplification
论文作者
论文摘要
我们对磁盘星系进行了本地$ N $的模拟，并研究螺旋臂的演变。我们计算螺旋臂表面密度的时间自相关，并发现典型的进化时间尺度由环环时代描述。我们研究了恒星的轨道元素的分布，发现在螺旋臂中，恒星的恒星运动处于相位，而引导中心的空间分布几乎均匀。这些事实清楚地表明，上环运动的相位同步发生，从理论上讲，这是通过秋千扩增预测的。
We perform local $N$-body simulations of disk galaxies and investigate the evolution of spiral arms. We calculate the time autocorrelation of the surface density of spiral arms and find that the typical evolution timescale is described by the epicycle period. We investigate the distribution of the orbital elements of stars and find that in spiral arms the epicycle motions of stars are in phase while the spatial distribution of the guiding center is nearly uniform. These facts clearly show that the phase synchronization of the epicycle motion takes place, which is theoretically predicted by the swing amplification.
