Can Gamma Ray Astronomy Disprove the Hypothesis That Cosmic Rays Originate in Supernova Remnants?

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Scientific paper

supernova remnants (SNR) appear to hold out the possibility of explaining the origin of cosmic rays, up to the `knee' in the energy spectrum at least. However, it has been claimed that the non-observation of many SNR in high energy gamma rays makes the mechanism unlikely (e.g. [13, 14, 18]). Here, we make an examination of this problem, with particular reference to the question of the density of gas into which SNR expand and to the problem of the visibility of SNR gamma ray sources. We conclude that the lack of (some) gamma ray sources does not preclude most cosmic rays from originating in SNR.

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