Highest-Energy Cosmic Rays
They have long been considered sites where high-energy particle production might take place. They swallow gas, dust and other matter from their host galaxies and spew out particles and energy.
While most galaxies have black holes at their centre, only a fraction of all galaxies have an AGN. The exact mechanism of how AGNs can accelerate particles to energies 100 million times higher than the most powerful particle accelerator on Earth is still a mystery.
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Breakthrough in Cosmic Ray mystery from SciTech
AGN and Ultra High Energy Cosmic Rays from Space Daily
AUGER: millions of TeV cosmic rays from black holes from The Reference Frame
Ultra High Energy Cosmic Rays (UHECR) from Auger @ BackReaction