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Cosmic rays could be produced via shock acceleration powered by supernovae.The supernova hypothesis implies that each supernova injects on average some1e50 erg in cosmic rays, while the shock acceleration model predicts a powerlawcosmic ray spectrum with the slope close to 2. Verification of thesepredictions requires measurements of spectrum and power of cosmic ray injectionfrom supernova population(s). Here we obtain such measurements based ongamma-ray observation of Constellation III region of Large Magellanic Cloud. Weshow that gamma-ray emission from this young star formation region originatesfrom cosmic rays injected by approximately two thousand supernovae, rather thanby massive star wind powered superbubble pre-dating supernova activity. Cosmicray injection power is found to be (1.1-0.2+0.5)x 1e50 erg/supernova (for theestimated interstellar medium density 0.3/cm3). The spectrum is a powerlaw withslope 2.09-0.07+0.06. This agrees with the model of particle acceleration atsupernova shocks and provides a direct proof of the supernova origin of cosmicrays.

Supernova origin of cosmic rays from a gamma-ray signal in the Constellation III region of the Large Magellanic Cloud