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Masses of Black Holes
Primordial – can be any size, including very small (If <1014 g, they would still exist)
“Stellar-mass” black holes – must be at least 3 Mo (~1034 g) – many examples are known
Intermediate black holes – range from 100 to 1000 Mo - located in normal galaxies – many seen
Massive black holes – about 106 Mo – such as in the center of the Milky Way – many seen
Supermassive black holes – about 109-10 Mo - located in Active Galactic Nuclei, often accompanied by jets – many seen
Notes:
Primordial black holes are hypothesized by many theorists, including Stephen Hawking. None have yet been detected. It is also hypothesized that the larger primordial black holes would have evaporated due to the emission of Hawking radiation by now. No Hawking radiation has yet been detected from any black holes that we have observed.