Those pions decay quickly into the gamma rays that the scientists tracked.
FORBES: Scientists Confirm Cosmic Rays Come From Exploding Stars
Both these supernova remnants are strong sources of the type of gamma rays one would expect from neutral pion decay.
BBC: Cosmic rays: Fermi telescope settles mystery of origin
The pions, in turn, will decay rapidly into very high-energy light, or gamma rays.
Meanwhile, the newly real particles decay, giving off (among other things) light, X-rays and gamma rays.
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