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Astronomy Reports

, 55:770 | Cite as

Gas dynamics of a central collision of two galaxies: Merger, disruption, passage, and the formation of a new galaxy

  • A. V. Tutukov
  • G. G. Lazareva
  • I. M. Kulikov
Article

Abstract

Results of numerical simulations of a collision of the gaseous components of two identical disk galaxies during a head-on collision of the galaxies in the polar direction are presented. When the relative velocity of the galaxy collision is small, their gaseous components merge. At high relative velocities (100–500 km/s), the massive stellar components of the galaxies (M g = 109 M ) pass through each other nearly freely, leaving behind the gaseous components, which are decelerated and heated by the collision. If the overall gaseous component of the colliding galaxies is able to cool to the virial temperature during the collision, a new galaxy forms. At velocities V ≥ 500 km/s, the gaseous component does not have time to cool, and the gas is scattered into intergalactic space, supplying it with heavy elements produced in supernovae in the colliding galaxies. High-velocity (V ≥ 100 km/s) collisions of identical low-mass galaxies (M g ≤ 109 M ) whose mass is dominated by the mass of gas lead to the disruption of their stellar components. The overall gaseous component forms a new galaxy when V ≤ 500 km/s, and is scattered into intergalactic space if the velocity becomes higher than this. A galaxy collision increases the star-formation rates in the disk galaxies by nearly a factor of 100. Rotation of the colliding galaxies in the same direction increases the changes of the disruption of both the stellar and gaseous components of the galaxies. The merger of galaxies during their collision can explain the presence of gaseous disks rotating opposite to the rotation of the stellar component in some ordinary elliptical galaxies. Moreover, galaxy mergers can help explain the origin of a comparatively young stellar population in some elliptical galaxies.

Keywords

Black Hole Dark Matter Star Formation Smooth Particle Hydrodynamic Astronomy Report 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Pleiades Publishing, Ltd. 2011

Authors and Affiliations

  • A. V. Tutukov
    • 1
  • G. G. Lazareva
    • 2
  • I. M. Kulikov
    • 2
  1. 1.Institute of AstronomyRussian Academy of SciencesMoscowRussia
  2. 2.Institute of Computational Mathematics and Mathematical GeophysicsSiberian Branch of the Russian Academy of SciencesNovosibirskRussia

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