背景非线性非定常系统扰动的引力不稳定性。IV。星系中双环结构的形成
Gravitational Instability of Perturbations in a Background Nonlinear Nonstationary Model of a Disk-Like System. IV. Formation of two-ring structures in galaxies
摘要：
为了确定星系中双环结构形成的精确判据，我们在具有精确非线性非定常律的复合盘模型[1-3]的背景下，研究了相应结构振动模的引力不稳定性问题。对于给定的结构振动模式的模型的色散方程的非定常类似物导出，并得到其分析结果。对环形振荡模式的不稳定性增量进行了比较分析，以确定其特征出现时间对模型主要物理参数的依赖性。
英文摘要：
In order to identify the exact criteria for the formation of two-ring structures in galaxies, we studied the issue of gravitational instability of the corresponding structural vibration modes against the background of a composite disk model [1-3], which has an exact nonlinear law of nonstationarity. Nonstationary analogs of dispersion equations for the given structural vibration modes of the model are derived and the results of their analysis are obtained. A comparative analysis of the increments of instabilities of ring-like oscillation modes is carried out to determine the dependence of their characteristic times of manifestation on the main physical parameters of the model.
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