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In our recent work, we demonstrated that a novel X-ray scaling method,originally introduced for Galactic black holes, could be reliably extended toestimate the mass of supermassive black holes accreting at moderate to highlevel. Here, we apply this X-ray scaling method to ultraluminous X-ray sources(ULXs) to constrain their \mbh. Using 49 ULXs with multiple \xmm\ observations,we infer that ULXs host both stellar mass BHs and intermediate mass BHs. Themajority of the sources of our sample seem to be consistent with the hypothesisof highly accreting massive stellar BHs with $M_{\rm BH}\sim100\,M_{\odot}$.Our results are in general agreement with the \mbh\ values obtained withalternative methods, including model-independent variability methods. Thissuggests that the X-ray scaling method is an actual scale-independent methodthat can be applied to all BH systems accreting at moderate-high rate.

Measuring the black hole mass in Ultraluminous X-ray Sources with the X-ray Scaling Method