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We report the discovery with XMM-Newton of an approximately 7 mHz X-ray(0.3-10.0 keV) quasi-periodic oscillation (QPO) from the eclipsing,high-inclination black hole binary IC 10 X-1. The QPO is significant at > 4.33sigma confidence level and has a fractional amplitude (% rms) and a qualityfactor, Q, of approximately 11 and 4, respectively. The overall X-ray (0.3-10.0keV) power spectrum in the frequency range 0.0001 - 0.1 Hz can be described bya power-law with an index of -2, and a QPO at 7 mHz. At frequencies > 0.02 Hzthere is no evidence for significant variability. The fractional amplitude(rms) of the QPO is roughly energy-independent in the energy range of 0.3-1.5keV. Above 1.5 keV the low signal to noise ratio of the data does not allow usto detect the QPO. By directly comparing these properties with the wide rangeof QPOs currently known from accreting black hole and neutron stars, we suggestthat the 7 mHz QPO of IC 10 X-1 may be linked to one of the following threecategories of QPOs: (1) the "heartbeat" mHz QPOs of the black hole sources GRS1915+105 and IGR J17091-3624, or (2) the 0.6-2.4 Hz "dipper QPOs" ofhigh-inclination neutron star systems, or (3) the mHz QPOs of Cygnus X-3.

Discovery of a 7 mHz X-Ray Quasi-periodic Oscillation from the most Massive Stellar-mass Black Hole IC 10 X-1