Suddenly the number of black holes available to us has doubled. The new spectrograph is a much more efficient way to look for black holes. Many people have been gearing up to find them. With 33 black holes available for research, scientists have enough material to develop a much clearer picture of how galaxies form and how black holes grow. For example, the latest discoveries reveal a fundamental new correlation between black hole mass and galaxy formation, as measured by the random velocities of stars.
Galaxies exist in two basic forms, with variations.
Kormendy explained that there are disk or Frisbee-shaped galaxies, such as the Milky Way, and denser, rounder galaxies bulging like partially deflated beach balls. Black holes appear to be closely connected with the properties of the elliptical or bulge-shaped galaxies, but pure disk galaxies do not seem to contain supermassive black holes. The properties of black holes suggest that they grow to their present sizes as part of the galaxy formation process.