Fast-moving stars around an intermediate-mass black hole in ω Centauri.

Black holes have been found over a wide range of masses, from stellar remnants with masses of 5-150 solar masses (M), to those found at the centres of galaxies with M > 10M. However, only a few debated candidate black holes exist between 150M and 10M. Determining the population of these intermediate-mass black holes is an important step towards understanding supermassive black hole formation in the early universe.