 Here's the magnificent spiral galaxy M106. It is a class of galaxy called a Seaforth Galaxy. Seaforth galaxies account for about 10% of all galaxies and are some of the most intensely studied objects in astronomy, as they are thought to be powered by the same phenomena that occur in quasars, although they are closer and less luminous than quasars. Seaforth galaxies have supermassive black holes at their centers which are surrounded by accretion disks of in-falling material. The accretion disks are believed to be the source of the observed ultraviolet radiation.