Gravitational Instability of Perturbations of a Nonlinear Nonstationary Model of a Disklike System. IV. Formation of Double-ring Structures in Galaxies

IF 1.2 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Gravitation and Cosmology Pub Date : 2021-09-14 DOI:10.1134/S0202289321030099

K. T. Mirtadjieva, K. A. Mannapova

引用次数: 0

Abstract

To find out precise criteria of double-ring structure formation in galaxies, we have studied the problem of gravitational instability of the corresponding structure oscillation modes in the background of a previously described compound disk model [1, 2, 3] with an exact nonlinear law of nonstationarity. Nonstationary analogs have been derived for the dispersion equations for these structure oscillation modes of the model, and the results of their analysis are discussed. A comparative analysis has been carried out for the instability increments of ringlike oscillation modes, aimed at determining the dependence of their characteristic manifestation times on the physical parameters of the model.

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盘状系统非线性非平稳模型摄动的引力不稳定性。星系中双环结构的形成

为了找到星系中双环结构形成的精确准则，我们研究了在先前描述的具有精确非线性非平稳律的复合盘模型[1,2,3]背景下相应结构振荡模式的引力不稳定性问题。对模型的这些结构振型的色散方程推导了非平稳类似物，并对其分析结果进行了讨论。对环形振荡模态的不稳定性增量进行了对比分析，旨在确定其特征表现时间对模型物理参数的依赖关系。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Gravitation and Cosmology ASTRONOMY & ASTROPHYSICS-

CiteScore

1.70

自引率

22.20%

发文量

审稿时长

>12 weeks

期刊介绍： Gravitation and Cosmology is a peer-reviewed periodical, dealing with the full range of topics of gravitational physics and relativistic cosmology and published under the auspices of the Russian Gravitation Society and Peoplesâ€™ Friendship University of Russia. The journal publishes research papers, review articles and brief communications on the following fields: theoretical (classical and quantum) gravitation; relativistic astrophysics and cosmology, exact solutions and modern mathematical methods in gravitation and cosmology, including Lie groups, geometry and topology; unification theories including gravitation; fundamental physical constants and their possible variations; fundamental gravity experiments on Earth and in space; related topics. It also publishes selected old papers which have not lost their topicality but were previously published only in Russian and were not available to the worldwide research community