A high speed jet of material shoots out of Centaurus A, a nearby galaxy whose central black hole is devouring its surroundings. At least four of the 27 ultra-high-energy cosmic rays detected by Auger appear to originate in CentaurusIntergalactic particle beam is longest yet
The most energetic particles in the universe have regained some of their former mystery. Last year, it seemed that the origin of these particles had finally been tracked down to a set of giant black holes in nearby galaxies, but a new study casts doubt on that conclusion.
Ultra-high-energy cosmic rays, or UHECRs, are individual sub-atomic particles with energies up to about 1020 electron volts, far beyond anything achieved in particle accelerators.
When they hit the Earth's atmosphere, they produce a shower of other particles, and the Pierre Auger Observatory in Argentina has spotted more of these events than any other detector.
New Scientist
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