Open AccessNonlinear cosmogony of the spiral galaxy bulges
Author(s) -
Farkhod Botirov,
С. Н. Нуритдинов
Publication year - 2022
Publication title -
astronomy at the epoch of multimessenger studies. proceedings of the vak-2021 conference, aug 23–28, 2021
Language(s) - English
Resource type - Conference proceedings
DOI - 10.51194/vak2021.2022.1.1.142
Subject(s) - physics , instability , superposition principle , classical mechanics , isotropy , bulge , diagram , nonlinear system , velocity dispersion , asymptote , anisotropy , galaxy , mechanics , astrophysics , geometry , quantum mechanics , mathematics , statistics
An early idea of one of the authors of this work is being developed, where the mechanism of instability of the warpperturbation mode against the background of an non-stationary disk was proposed for the rst time in [1]. For this purpose,a model of a nonlinearly non-stationary self-gravitating disk with an anisotropic velocity diagram was rst constructed. Themodel has a composite nature, or rather, it is a superposition of isotropic and anisotropic states of the disk. A nonstationaryanalogue of the dispersion equation of this composite model in the general case is obtained. The behavior of the domeddisturbance mode, the instability of which leads to the formation of a classical bulge in the central region of the disk, isinvestigated. Critical diagrams of the dependence of the virial ratio on the degree of rotation of the system for various valuesof the superposition parameter and the corresponding diagrams for the increments of instability are constructed.