Abstract
The sharpness of the knee in the cosmic ray (CR) energy spectrum observed at an energy of 3-4 PeV can be caused by the contribution of a relatively young and nearby single source. The application of the models for the acceleration and propagation of CR in the Galaxy allows us to estimate the limits for the distance to the source and its age. The Vela cluster containing supernova remnants (SNR) and pulsar is within these limits. The paper presents additional arguments based on the anisotropy and the structure of the CR energy spectrum at PeV energies and above in favour of the Vela SNR (and, possibly, the associated pulsar) being such a single source responsible for the formation of the knee.
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