Modeling multiband emissions from two young SNRs with a time-dependent magnetic field

The nonthermal components in hard X-rays have been detected in two young supernova remnants (SNRs): SN 1006 and Kepler's SNR. Various theoretical models showed that the amplification of the magnetic field was crucial to explain their multiband emission properties. We investigate the evolution of the magnetic field and model the multiband emissions from these two young SNRs with a time-dependent injection model. The results indicate that (1) the radio and X-ray emissions are reproduced by synchrotron radiation of the injected electrons, while the γ-rays can be explained as inverse Compton scattering of the relativistic electrons and proton-proton interaction of the high-energy protons; and (2) the amplification of the magnetic field spontaneously happens with reasonable parameters