But it wasn't clear whether this was caused by an "intermediate mass" black hole (IMBH), weighing a hundred thousand times the mass of the sun, or a cluster of "stellar mass" black holes ...
It is the first time a stellar pair has been found in the vicinity of a supermassive black ... Astrophysicists Capture Astonishing Images of Gamma-Ray Flare from Supermassive Black Hole M87 Dec.
But it wasn't clear whether this was caused by an "intermediate mass" black hole (IMBH), weighing a hundred thousand times the mass of the Sun, or a cluster of "stellar mass" black holes ...