Further analysis allowed the scientists to determine which of the objects are galaxies containing massive central black holes that are actively consuming surrounding material and which are galaxies undergoing rapid bursts of star formation. (sciencedaily.com)
For reasons not fully understood, it appears that the sizes of central black holes and the masses of their galaxies, especially the central bulges, are almost perfectly in step (creationscience.com)
On October 16, 2002, the European Southern Observatory (ESO) announced that a team of astronomers (led by researchers at the Max - Planck - Institute for Extraterrestrial Physics (MPE)-RRB- had developed strong evidence of the existence of a supermassive central black hole in the Milky Way, by plotting out about two - thirds of S2's orbit around an apparent superdense object, using direct infrared and radio observations of the star's orbital motion since 1992. (solstation.com)