Математическая физика и компьютерное моделирование2587-63252587-690210.15688/mpcm.jvolsu.2023.3.7OtherМоделирование двугорбых кривых вращения газа в осесимметричном гравитационном поле галактикModeling a Double-Hump Gas Rotation Curves in the Axisymmetric Gravitational Field of GalaxiesПейчМаксим МаксимовичPejchMaxim M.maxpejch@mail.ruhttps://orcid.org/0009-0000-5022-8634МорозовАлександр ГаврииловичMorozovAlexander G.moralegav@gmail.comhttps://orcid.org/0009-0002-4213-9740ХоперсковАлександр Валентиновичkhoperskov@volsu.ruhttps://orcid.org/0000-0003-0149-7947Volgograd State University ( Volgograd, Russian Federation)Волгоградский государственный университет (Волгоград, Российская Федерация)Volgograd State University (Volgograd, Russian Federation)Волгоградский государственный университет (Волгоград, Российская Федерация)24102023263921042807202320082023https://creativecommons.org/licenses/by-nc-nd/4.0/CC BY-NC-ND 4.0

Представлены результаты построения моделей галактических дисков с так называемыми двугорбыми кривыми вращения газа, когда имеются зоны резкого изменения круговой скорости. Такие модели допускают развитие сдвиговых гидродинамических неустойчивостей, в частности, центробежной неустойчивости и неустойчивости типа акустического резонанса. В построенных моделях внутренний пик скорости вращения связан с наличием околоядерного звездного диска. Изучено влияние параметров модели как внутреннего, так и основного экспоненциального звездного диска на радиальные профили круговой скорости. Развит численный метод, обеспечивающий построение двугорбых кривых вращения с произвольными распределениями поверхностной плотности звездного диска. Сформирована выборка галактик с кривыми вращения, содержащими области резких отрицательных градиентов. Модели этих объектов предназначены для проведения вычислительных экспериментов, направленных на изучение образования спиральных структур вследствие развития гидродинамической неустойчивости. Мы выбрали объекты, кривые вращения которых в центральной области не могут быть смоделированы сфероидальными галактическими балджами, что указывает на наличие особых компонент в составных моделях звездного диска, похожих на околоядерные диски.

We present the results of constructing models of galactic disks with gas rotation curves that have zones of sharp changes in circular velocity. Such models allow the development of shear hydrodynamic instabilities, in particular centrifugal instability and acoustic resonance-type instability. A sample of galaxies with rotation curves containing regions of sharp negative gradients has been formed. Models of these objects are intended for carrying out computational experiments aimed at studying the generation of spiral patterns due to the development of hydrodynamic instability. We have identified objects whose rotation curves in the central region cannot be modeled by the spheroidal bulge subsystem, which indicates the presence of special components in composite models of the stellar disk.

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