• Corpus ID: 119523686

Collisional Ring Galaxies in Small Groups

  title={Collisional Ring Galaxies in Small Groups},
  author={Cathy Horellou Onsala Space Observatory and Chalmers University of Technology and Sweden.},
The probability of plunging orbits is enhanced in groups of galaxies and indeed, observations show that ring galaxies, which are believed to form when a galaxy passes through the center of a larger rotating disk, are often found in small groups. Numerical simulations combined with a knowledge of the large-scale HI distribution provide strong constraints on the dynamical history of these systems and on the identity of the intruder. Here we present a numerical model of the Cartwheel which…