MERGING OF SPIRAL GALAXIES: OBSERVATIONS AND MODELING
Авторы:
1.
Volgograd State University
2.
Volgograd State University
3.
Volgograd State University
4.
Sternberg Astronomical Institute, Moscow M.V. Lomonosov State University
Faculty of Physics, Moscow M.V. Lomonosov State University
Faculty of Physics, Moscow M.V. Lomonosov State University
Тип:
Статья конференции
Опубликовано:
27.12.2024
Классификаторы:
УДК 52 Астрономия. Геодезия
УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
Язык материала:
английский
Ключевые слова:
galaxies: interactions, evolution, structure
Финансирование:
This work supported by the Russian Science Foundation~(grant no. 23-71-00016, https://rscf.ru/project/23-71-00016/). The research also relied on the shared research facilities of the HPC computing resources at Lomonosov Moscow State University.
Аннотация (русский):
We present a study of the dynamics of multi-component models of spiral galaxies at different stages of grand mergers. The numerical models include a self-consistent account of the dynamics of collisionless stellar subsystems and N-body dark matter, as well as gaseous components. The calculation of gas heating and cooling processes allows us to consider a wide temperature range from 80 to 100 thousand degrees. The use of the method of Smoothed-particle hydrodynamics to solve the hydrodynamic equations makes it possible to follow the evolution of the gas of each galaxy, calculating the content of gaseous components of each object in the process of complex exchange of matter. The gravitational interaction is determined in a direct way by summing the contributions according to Newton’s law, which minimizes the modeling error. This requires significant computational resources using graphics accelerators on a hybrid computing platform CPU + multi-GPUs. The study aims to reconcile theoretical models with the morphology and kinematics of a number of observed systems. In particular, Taffy-type objects are considered, where two galaxies are connected by a gas bridge with a characteristic small-scale gas structure after the disks have passed through each other in an approximately flat orientation. Examples of such systems are the observed galaxy pairs UGC 12914/UGC 12915, NGC 4490/NGC 4485, UGC813/UGC816 etc.
We present a study of the dynamics of multi-component models of spiral galaxies at different stages of grand mergers. The numerical models include a self-consistent account of the dynamics of collisionless stellar subsystems and N-body dark matter, as well as gaseous components. The calculation of gas heating and cooling processes allows us to consider a wide temperature range from 80 to 100 thousand degrees. The use of the method of Smoothed-particle hydrodynamics to solve the hydrodynamic equations makes it possible to follow the evolution of the gas of each galaxy, calculating the content of gaseous components of each object in the process of complex exchange of matter. The gravitational interaction is determined in a direct way by summing the contributions according to Newton’s law, which minimizes the modeling error. This requires significant computational resources using graphics accelerators on a hybrid computing platform CPU + multi-GPUs. The study aims to reconcile theoretical models with the morphology and kinematics of a number of observed systems. In particular, Taffy-type objects are considered, where two galaxies are connected by a gas bridge with a characteristic small-scale gas structure after the disks have passed through each other in an approximately flat orientation. Examples of such systems are the observed galaxy pairs UGC 12914/UGC 12915, NGC 4490/NGC 4485, UGC813/UGC816 etc.
Ключевые слова:
galaxies: interactions, evolution, structure
galaxies: interactions, evolution, structure
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