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Aims: LS 5039 is an enigmatic high-mass gamma-ray binary which hosts apowerful O6.5V companion, but the nature of the compact object is still to beestablished using multi-wavelength observations. Methods: We analyzedphase-resolved multi-instrument spectra of nonthermal emission from LS 5039 inorder to produce reliable spectral models, which can be further employed toselect between various scenarios and theoretical models of the binary. Results:The combined phase-resolved hard X-ray and MeV-range gamma-ray spectra obtainedwith XMM-Newton, Suzaku, NuSTAR, INTEGRAL, and COMPTEL indicate a meaningfulspectral hardening above 50~keV. The spectral break observed in both majorphases of the binary may indicate the presence of a hardening in the spectrumof accelerated leptons which could originate from the interaction of wind fromthe O6.5V companion star with the relativistic outflow from a yet unidentifiedcompact object.

Phase-resolved hard X-ray emission of the high-mass binary LS 5039: a spectral hardening above 50 keV detected with INTEGRAL