Counter-Rotation in Disk Galaxies
  Counter-rotating galaxies host two components rotating in opposite directions with respect to each other. The kinematic and morphological properties of lenticulars and spirals hosting counter-rotating components are reviewed. Statistics of the counter-rotating galaxies and analysis of their stellar populations provide constraints on the formation scenarios which include both environmental and internal processes. 
E. M. Corsini (Dipartimento di Fisica e Astronomia 'Galileo Galilei',   Universita` di Padova, Padova, Italy)
astro-ph.GA astro-ph.CO