The Steady Nonlinear Shock Acceleration And Non-thermal Radiation Of Shell-type Supernova Remnants

Supernova remnants (SNRs) are generally believed to be not only high-energy ra-diation sources but also cosmic rays in our galaxy. In this thesis, after briefly reviewing the basic properties, classification, particle acceleration, and radiation mechanisms of the SNRs. the multi-band non-thermal radiation features of the SNRs are investigated. Our mainly works include as follows:(1) the turbulent heating effect (non-adiabatic) is included firstly in the calculation of accelerated proton spectrum using the theory of non-linear diffusive shock acceleration with a free escape boundary, the cut-off energy of accelerated proton’s spectrum is determined by a given free escape boundary, but the cut-off energy of accelerated electron’s spectrum is estimated by equating synchrotron cooling timescale to acceleration timescale. In this model, the non-thermal spectrum for a shell-type SNR is mainly produced by synchrotron radiation and inverse Compton scattering of accelerated electrons as well as π0-decay y-rays in proton-proton inter-action:(2) the influence of4important model parameters on the non-thermal spectrum for a given SNR are studied:and (3) the model is applied to three shell-type SNRs:RX J1713.7-3946. RX J0852.0-4622. and SN1006. and the observed multi-band spectra of these SNRs are reproduced. Our calculating results show that high-energy γ-ray emissions from these SNRs may have hadronic origins.