Constraints on the SNR Origin of Cosmic Rays from Gamma-Ray Observations in the TeV Region

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Scientific paper

If shell-type supernova remnants (SNRs) are the acceleration site of cosmic rays in the energy region of less than at least 100 TeV, the associated interactions should result in a detectable flux of gamma-rays in the TeV region for each of nearby these SNRs. Many searches for gamma-ray emission have been performed with imaging ˇCerenkov telescopes and air-shower arrays in the sub-TeV and/or supraTeV regions. However, most of measurements failed in observations of significant emission. We set the flux limits on gamma-ray emission from nearby SNRs in the TeV region by using these data. These results constrain model predictions of diffusive shock acceleration of cosmic rays in the shelltype SNRs.

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