- csep10.phys.utk.edu/astr162/lect/active/smblack.html
- Supermassive Black Holes in Galactic Nuclei Black holes with masses of a million to a few billion times the mass of the Sun are believed to be the engines that power nuclear activity in galaxies. Active nuclei range from faint, compact radio sources like that in M31 to quasars like 3C 273 that are brighter than the whole galaxy in which they live. Some nuclei fire jets of energetic particles ...chandra.as.utexas.edu/~kormendy/bhsearch.html