Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-05-31
ApJ (1998) Vol.505, pp.607
Astronomy and Astrophysics
Astrophysics
15 pages, 14 figures in GIF. To appear ApJ. Vol. 505 #2
Scientific paper
10.1086/306198
Using N-body and SPH modeling we perform 3D numerical simulations of head-on collisions between gas rich disk galaxies, including collisions between counter-rotating disks and off-center collisions. Pure stellar intruders do not produce gaseous plumes similar to those seen in the Cartwheel and VII Zw466 complexes of interacting galaxies; the presence of gas in an intruder galaxy and radiative cooling are important for the formation of a gaseous plume extending from the disk of a target galaxy. A noticeable plume structure can be formed if the mass of an intruder is a few percent of the mass of the primary. The halo of the intruder is stripped in the collision, and dispersed particles form a broad stellar bridge connecting the two galaxies. The fraction of the intruder's halo dispersed in the collision depends on the total mass of the intruder, and low-mass intruders lose most of their mass.
Korchagin Vladimir
Tsuchiya Toshio
Wada Keiichi
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