Chemical radial gradient evolution in massive galaxy disk due to its minor merger with dwarf galaxy (http://www.ari.uni-heidelberg.de/sfb439/sfb439-b11/Results/sfb_ShuBer.html)
http://www.ari.uni-heidelberg.de/sfb439/sfb439-b11/Results/sfb_results1.html
(http://www.ari.uni-heidelberg.de/sfb439/sfb439-b11/Results/Animation50.gif)