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We report the discovery of the correlated optical/X-ray low-frequencyquasi-periodic oscillations (QPOs) in black hole binary SWIFT J1753.5-0127. Thephase lag between two light-curves at the QPO frequency is close to zero. Thisresult puts strong constraints on the nature of the optical emission in thisobject and on the origin of the QPOs in general. We demonstrate that the QPOsignal and the broadband variability can be explained in terms of the hotaccretion flow radiating in both optical and X-ray bands. In this model, theQPO appears due to the Lense-Thirring precession of entire flow, while thebroadband variability in the optical is produced by two components: the hotflow and the irradiated disc. Using the phase-lag spectra, we put a lower limiton the orbital inclination i>50 deg, which can be used to constrain the mass ofthe compact object.

Discovery of correlated optical/X-ray quasi-periodic oscillations in black hole binary SWIFT J1753.5-0127