An Intermediate-mass black hole (IMBH) is a black hole whose mass is significantly more than stellar black holes (ten times to several tens of times the mass of the Sun) yet far less than supermassive black holes (one million to many million times the mass of the Sun). Considerably fewer of these objects are believed to exist when compared with the relative abundance of observed black holes in the stellar and supermassive mass ranges. Since the mechanisms by which IMBHs are formed are uncertain, it is consequently not entirely clear as why this significant discrepancy of relative abundances exists.
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