Inverse Compton Gamma-ray Background due to Supernova Remnants

摘要

We study the contribution of the source cosmic rays(SCRs),confined in supernova remnants(SNRs),to the diffuse high energy gamma-ray emission above 1 GeV from the Galactic disk.Gamma-rays produced by the SCRs have a much harder spectrum compared with those generated by the Galactic cosmic rays(GCRs)which uniformly occupy a much larger residence volume.The contribution of the SCRs becomes dominant at gamma-ray energies above 10 GeV and at TeV energies it exceeds the flux due to nuclear GCRs by more than one order of magnitude.Accurate measurements of the diffuse Galactic gamma-ray emission at TeV-energies can provide an important test for the CR origin from such sources.