In this paper, the nature and behavior of small-scale perturbation modes in disc-shaped galaxies were considered. The gravitational instabilities of horizontal small-scale perturbation modes, such as (m;N)=(12;20) (14;20), (16;20) and (18;20) are calculated against the background of a nonlinear nonequilibrium pulsating anisotropic model of a self-gravitating disk. For each of these perturbation modes, critical diagrams are constructed between the virial parameter and the degree of rotation, and instability increments are calculated and compared for different values of the rotation parameter. The results of calculations and comparisons of instability regions show that with increase in the degree of small-scale, except the disturbance modes (m;N)=(14;20), the instability region narrows, as the azimuth wave number m increases. In critical diagrams, except for the case (m;N) = (18;20), a small area of stability is observed. In the interval Ω =∈ ÷ [0.2 1.0] of rotation parameter, there are short lines of the perturbation mode (12;20), (14;20) and (16;20) which are intersected with each other at some values of the increments of instabilities. The perturbation mode (14;20) has the largest increment values starting from the value of rotation parameter Ω = 0.6 .
| Mualliflar | Ганиев, Ж.М. |
|---|---|
| Jurnal | O‘zbekiston fizika jurnali |
| Nashr sanasi | 2021-11-04 |
| Jild | 23 |
| Son | 2 |
| Betlar | 1-10 |
| Til | Rus |
| DOI | 10.52304/.v23i2.233 |
DOI: 10.52304/.v23i2.233 · Maqolaning asl sahifasi
нелинейно-нестационарные модели, самогравитирующий диск, гравитационная неустойчивость, мелкомасштабные моды возмущений., nonlinear non-stationary models, self-gravitating disks, gravitational instability, small-scale perturbation modes.
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