Large Hubble Survey Confirms Link between Mergers and Supermassive Black Holes with Relativistic Jets by NASA Goddard Photo and Video on Flickr.

Via Flickr:
A team of astronomers using the Hubble Space Telescope found an unambiguous link between the presence of supermassive black holes that power high-speed, radio-signal-emitting jets and the merger history of their host galaxies. Almost all galaxies with the jets were found to be merging with another galaxy, or to have done so recently.

Credit: NASA/ESA/STScI