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Using data from the XMM-Newton and INTEGRAL observatories, we have detected acutoff at energies above 10 keV in the X-ray spectra of the ultraluminous X-raysources HoIX X-1 and M82 X-1. The spectra obtained can be described by a modelof Comptonization of radiation in a gas cloud of moderate temperature (kT~2-3keV) and high optical depth (tau~15-25). Such conditions can be fulfilledduring supercritical accretion of matter onto a stellar-mass black holeaccompanied by a strong gas outflow. The results of this work confirm theexistence of a spectral state specific to ultraluminous X-ray sources, which isunlike any of the known spectral states in normal X-ray binaries.

Cutoff in the hard X-ray spectra of the ultraluminous X-ray sources HoIX X-1 and M82 X-1