Search academic texts

Information × Registration Number 0222U003509, 0121U109919 , R & D reports Title High-energy processes and manifestations of new physics in astrophysical gamma sources: Ukraine's contribution to STA popup.stage_title Head Ponomarenko Vasyl O., Кандидат фізико-математичних наук Registration Date 05-04-2022 Organization Taras Shevchenko National University of Kyiv popup.description2 Object of research: Supernova remnants (NRs), pulsars, magnetars, galaxy clusters, active galaxy nuclei (ANN). Objective: to improve existing and develop new models for generating gamma radiation of astrophysical objects included in key scientific projects of STA and, based on them, substantiation of strategy and forecast evaluation of the results of their observations at the JLLC. Research methods: methods of theoretical astrophysics and mathematical statistics, numerical modeling, experimental methods of registration of electromagnetic all-wave radiation from astronomical objects. Modeling of magnetohydrodynamic processes and formation of shock waves in galaxy clusters is carried out. Based on them, the simulation of the acceleration of the KP in galaxy clusters was modeled and the total energies, spectra, and spatial distribution of the accelerated KP were calculated. The results are applied to the simulation observed data on non-thermal radiation of cosmic rays in the cluster of Veronica's Hair. Close clusters have been identified as potential sources of extremely high energy cosmic rays. Definitely restrictions on the parameters of axion-like particles (ALPs) of dark matter, which will be obtained from the analysis of the CTA spectrum of NGC1275 in the Perseus cluster. Proposals for the JLLC monitoring program have been prepared. Observations of the Tycho Brahe supernova remnant (SN 1572) from the Chandra Space X-ray Observatory were analyzed. According to the observations, a residual map was created for different photon energy ranges, in particular, for the thermal continuum (4.1–6.0 keV) and the Si (1.6–2.1 keV) and S (2.3–2.6 keV) lines. The spectra of thermal X-rays in the brightest lines of silicon and sulfur from small local regions, which cover the entire surface of the residue, were obtained and analyzed.  Product Description popup.authors Beshlei Vasyl V. Hnatyk Bohdan I. Hnatyk Roman В. Zhdanov Valerii I. Petruk Oleh L. Sergienko Olga M. popup.nrat_date 2022-04-05 Close