
Astronomers have performed an extensive search for Dust Obscured Galaxies (DOGs). The research group discovered 48 DOGs, and has measured how common they are. Since DOGs are thought to harbor a rapidly growing black hole in their centers, these results give us clues for understanding the evolution of galaxies and supermassive black holes.
http://www.sciencedaily.com/releases/2015/08/150827083536.htm