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| Paper: |
The Discovery and Modeling of O-Type-Like Collisional Ring Galaxies |
| Volume: |
477, Galaxy Mergers in an Evolving Universe |
| Page: |
101 |
| Authors: |
Wu, Y.-T.; Jiang, I.-G. |
| Abstract: |
A new type of ring galaxies is discovered from the catalog of
collisional ring galaxies in Madore et al. (2009).
They are galaxies with axis-symmetric rings but originally classified as
P-type collisional ring galaxies due to the existence of nearby companions.
We call them O-Type-Like Collisional Ring Galaxies and model their
formation through simulations of head-on galactic mergers.
After head-on collisions by dwarf galaxies moving along the symmetric axis
of disk galaxies, it was found that the simulations with smaller initial
relative velocities between two galaxies, or the cases with heavier dwarf
galaxies, could produce rings with higher density contrasts.
There are more than one generation of rings in one collision and the
lifetime of any generation of rings is about one dynamical time.
We found that head-on penetrations could explain
O-Type-Like Collisional Ring Galaxies well and
the simulated rings resembling the observational
images of rings are those at the early stage of one of the
ring-generations. |
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