Telezhinsky I. Non-thermal X-Ray and Gamma Ray Radiation from Supernova Remnants

Supernova Remnants are the most promising candidates for the cosmic rays acceleration sites up to the energies of 10^14 -- 10^15 eV. Unfortunately, we are still missing the direct provement of the hadron acceleration in Supernova Remnants. The very significant evidence for the hadron acceleration in Supernova Remnants is the gamma ray flux from the decay of pi^0-mesons that are born in inelastic collisions of relativistic hadrons with protons of the interstellar medium. Another evidence would be the X-ray synchrotron radiation of the secondary leptons that are born in decays of pi^+, pi^- which in turn are born simultaneously and in equal amount with pi^0. The high fluxes of the non-thermal radiation can be detected from the Supernova Remnants evolving in special environment or as it is shown in the thesis from the ordinary Supernova Remnants during one of their evolutionary stages. The approximate analytical method that allows to model 2D and 3D Supernova Remnants at the transition from adiabatic to radiative stage of evolution was developed in the thesis. The method is applied to uniform and nonuniform interstellar medium. Taking advantage of the developed method, the X-ray and the hard gamma ray radiation from the remnants at the transition stage have been modeled. It was shown that the formation of the dense shell during the transition stage is accompanied by the increase of the non-thermal fluxes due to increase of the number density of the target particles and the increase of the energy of cosmic rays in the newborn shell. The calculations of the expected fluxes of the non-thermal radiation from the Supernova Remnants at the transition stage are presented in the thesis. The comparison of the expected fluxes with the sensitivity of the modern instruments (H.E.S.S., INTEGRAL) is given.