流体的垂直振荡与恒星的垂直振荡
Vertical Oscillations of Fluid and Stellar Disks
摘要：
一个卫星星系或暗物质次晕穿过恒星盘时，可能会在垂直于其平面的盘中激发相干振荡。我们确定这些模式的各种自引力平面对称系统（斯皮策片）使用矩阵方法的Kalnajs的属性。特别是，我们发现一个无限系列的正压流体的情况下的模式。一般来说，对于一个无碰撞系统，有一个双系列的模式，其中包括正常模式和/或朗道阻尼振荡取决于相空间分布函数的恒星。甚至朗道阻尼振荡也可能衰减得很慢，足以持续几百万年。我们讨论了这些结果的影响，最近发现的垂直扰动的运动学的太阳附近的恒星和更广泛的问题周围的长期现象，如螺旋结构在盘星系。
英文摘要：
A satellite galaxy or dark matter subhalo that passes through a stellar disk may excite coherent oscillations in the disk perpendicular to its plane. We determine the properties of these modes for various self-gravitating plane symmetric systems (Spitzer sheets) using the matrix method of Kalnajs. In particular, we find an infinite series of modes for the case of a barotropic fluid. In general, for a collisionless system, there is a double series of modes, which include normal modes and/or Landau-damped oscillations depending on the phase space distribution function of the stars. Even Landau-damped oscillations may decay slowly enough to persist for several hundred Myr. We discuss the implications of these results for the recently discovered vertical perturbations in the kinematics of solar neighborhood stars and for broader questions surrounding secular phenomena such as spiral structure in disk galaxies.
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