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We describe a new method to estimate the mass of black holes in Ultraluminous X‐ray Sources (ULXs). The method is based on the recently discovered ‘variability plane’, populated by Galactic stellar‐mass black‐hole candidates (BHCs) and supermassive active galactic nuclei (AGNs), in the parameter space defined by the black‐hole mass, accretion rate and characteristic frequency. We apply this method to the two ULXs from which low‐frequency quasi‐periodic oscillations have been discovered, M82 X‐1 and NGC 5408 X‐1. For both sources we obtain a black‐hole mass in the range  100–1300 M ⊙  , thus providing evidence for these two sources to host an intermediate‐mass black hole.

Weighing the black holes in ultraluminous X‐ray sources through timing