Abstract
The sharpness of the knee in the cosmic ray (CR) energy spectrum observed at energies of 3–4 PeV could be due to the contribution from a relatively young and nearby single source. Using models for the acceleration and propagation of CRs in the Galaxy allows the limits on the distance to the source and its age to be estimated. The Vela cluster is shown to lie within these limits. Additional arguments based on the anisotropy and structure of the CR energy spectrum at PeV and above are presented in favor of Vela as one such single source responsible for the formation of the knee.
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