Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-09-10
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
29 pages, 14 figures, published in MNRAS, Online Early
Scientific paper
10.1111/j.1365-2966.2009.15327.x
Motivated by the observations on the intra-cluster light (ICL) and inter-galactic stellar populations, n-body simulations are used to model the galactic merging events as a goal to investigate the production and distribution of gravitational unbound populations (GUPs). Both the parabolic and hyperbolic mergers are considered and each category includes six models with different relative orientations between two galaxies. Our results show that there are more (about a factor of two) GUP after a hyperbolic merging event than after a parabolic one. In general, depending on the relative orientation and also the relative velocity of the two galaxies in a merging pair, a head-on collision of a galaxy pair would only make a tiny fraction (less than one percent) of the initial stellar mass become luminous GUP but a considerable fraction (eight to fourteen percent) of the dark matter become dark GUP.
Jiang Ing-Guey
Wu Yu-Ting
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