Geodesic
Numerical modelling of the dynamics of the galactic halos in the colliding galaxies
Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematičeskoe modelirovanie i programmirovanie, Tome 12 (2019) no. 2, pp. 123-135

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Based on parallel three-dimensional simulation of N-body and gas self-consistent dynamics, we study the behavior of hot coronal gas in the colliding galaxies with “live” dark matter halos. We model a few scenarios of the galactic collisions including “bull-eye” and non-central ones, and use different values of the initial velocities of the colliding galaxies. Taking into account the self-gravity, we demonstrate that the collision of gaseous and stellar components does not lead to the formation of a gaseous “protogalaxy” observed in some numerical simulations. Also, we show that about sixty percent of hot halo gas is expelled into intergalactic space during the collision. Numerical simulations show that a considerable amount of gas (up to 70% for a bull-eye collisions) exchanges between two colliding galaxies.
Keywords: Multi-GPU, OpenMP-CUDA, GPU-Direct, NVIDIA TESLA, N-body, SPH, colliding galaxies. 
@article{VYURU_2019_12_2_a9,
     author = {S. S. Khrapov and A. V. Khoperskov and V. I. Korchagin},
     title = {Numerical modelling of the dynamics of the galactic halos in the colliding galaxies},
     journal = {Vestnik \^U\v{z}no-Uralʹskogo gosudarstvennogo universiteta. Seri\^a, Matemati\v{c}eskoe modelirovanie i programmirovanie},
     pages = {123--135},
     publisher = {mathdoc},
     volume = {12},
     number = {2},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/VYURU_2019_12_2_a9/}
}
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S. S. Khrapov; A. V. Khoperskov; V. I. Korchagin. Numerical modelling of the dynamics of the galactic halos in the colliding galaxies. Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematičeskoe modelirovanie i programmirovanie, Tome 12 (2019) no. 2, pp. 123-135. http://geodesic.mathdoc.fr/item/VYURU_2019_12_2_a9/