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We report the discovery of low-frequency quasi-periodic oscillations (QPOs)in the power spectrum of the X-ray nova MAXI J1535-571 at the initial stage ofits outburst in September 2017. Based on data from the SWIFT and INTEGRALinstruments, we have traced the evolution of the QPO parameters (primarilytheir frequency) with time and their correlation with changes in the X-rayspectrum of the source (changes in the emission flux and hardness). We placeconstraints on the theoretical QPO generation models.

Low-Frequency Quasi-Periodic Oscillations in the X-ray Nova MAXI J1535-571 at the Initial Stage of Its 2017 Outburst