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Study of a Near-Сritical Regime of Accretion in X-Ray Binary M33 X-6

Student: Nikolaeva Svetlana

Supervisor: Sergey Sazonov

Faculty: Faculty of Physics

Educational Programme: Physics (Master)

Year of Graduation: 2021

In this work we refined a model for the broadband spectrum of M33 X-6 based on data from NuSTAR and XMM-Newton observatories in the energy range 0.3–20 keV. The spectrum can be fairly well described by the emission model of a thick accretion disk with a temperature at the inner boundary of about 2.86 keV, or by the emission model of a standard (thin) accretion disk with a temperature of about 0.26 keV with the addition of a hard component, which can be associated with the Comptonization of radiation in the hot corona of the disk and / or in the boundary layer between the disk and the surface of the neutron star. The source doesn't show strong changes in the X-ray flux in the period from 2000 to 2017, and its average luminosity in the range 0.3–10 keV is about 2.3 × 10 38 erg / s, which roughly corresponds to the Eddington limit for a neutron star. However, no strong changes in the spectral states of the source were found, which is not typical for Z sources, thus, the source is subject to further study.

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