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0223U002062,
0121U109919
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High-energy processes and manifestations of new physics in astrophysical gamma sources: Ukraine's contribution to STA
Ponomarenko Vasyl O., Кандидат фізико-математичних наук
07-02-2023
Taras Shevchenko National University of Kyiv
Object of research: Remnants of Supernovae, clusters and superclusters of galaxies, active galactic nuclei (AGN). Purpose of the work: improvement of existing and development of new models of gamma radiation generation (TeV) of astrophysical objects included in key scientific projects of CTA, and, based on them, justification of the strategy and predictive assessment of the results of their observations on the CTAO. Research methods: methods of theoretical astrophysics and mathematical statistics, numerical modeling, and experimental methods of recording electromagnetic all-wave radiation from astronomical objects. Models of the distribution of plasma parameters and magnetic fields in galaxy clusters at different stages of evolution have been developed. Calculated characteristics of gamma radiation of very high energies in relaxed and unrelaxed galaxy clusters. The flux and spectrum of very high-energy gamma radiation from the Shapley Supercluster is obtained taking into account the contribution of some of the most massive Abell galaxy clusters. The mechanisms of formation of radio and X-ray radiation from the remnants of supernovae were investigated. The orientations of the magnetic field, its gradient, and the density gradient of the medium were determined based on observations of young remnants of supernovae in the radio and X-ray bands. Examples of model light curves of active galactic nuclei in the TeV and multi-TeV range of energies that can be implemented in CTA observations have been constructed. The theoretical and observational results related to the modifications of the standard cosmological model and the search for the effects of "new physics" are analyzed. Using the results of our own photometric observations of the AGN Mrk 501 in the optical range the brightness changes in BVRI filters were detected, and the mechanisms of brightness fluctuations and color indexes were analyzed.
Babur Valentyna М.
Beshlei Vasyl V.
Hnatyk Bohdan I.
Hnatyk Roman В.
Zhdanov Valerii I.
Petruk Oleh L.
2023-02-07
Updated: 2025-12-16
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