Rings of star formation: Imprints of a close galaxy encounter
  In this talk, I report results from galaxy merger simulations, which suggest the existence of a ring of star formation produced by close galaxy encounters. This is a generic feature of all galaxy interactions, provided that the disc spins are sufficiently aligned. This signature can be used to identify close galaxy pairs that have actually suffered a close interaction. 
Jorge Moreno
astro-ph.GA astro-ph.CO