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Low-Frequency Quasi-Periodic Oscillations in the X-ray Nova MAXI J1535-571 at the Initial Stage of Its 2017 Outburst
Grebenev, S. A.; Mereminskiy, I. A.; Semena, A. N. +1 more
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 of its outburst in September 2017. Based on data from the SWIFT and INTEGRAL instruments, we have traced the evolution of the QPO parameters (primarily their frequency) with time and their correlat…
Optical Identification of X-ray Sources from the 14-Year INTEGRAL All-Sky Survey
Medvedev, P. S.; Lutovinov, A. A.; Eselevich, M. V. +6 more
We present the results of our optical identifications of several hard X-ray sources from the INTEGRAL all-sky survey obtained over 14 years of observations. Having improved the positions of these objects in the sky with the X-ray telescope (XRT) of the Swift observatory and the XMMNewton observatory, we have identified their counterparts using opt…
Single X-ray Bursts and the Model of a Spreading Layer of Accreting Matter over the Neutron Star Surface
Grebenev, S. A.; Chelovekov, I. V.
The excess of the rate of type I X-ray bursts over that expected when the matter fallen between bursts completely burns out in a thermonuclear explosion which is observed in bursters with a high persistent luminosity (4 × 1036 ≲ L X ≲ 2 × 1037 erg s-1) is explained in terms of the model of a spreading …