Extragalactic cosmic rays are very-high-energy particles that flow into the Solar System from beyond the Milky Way galaxy. While at low energies, the majority of cosmic rays originate within the Galaxy (such as from supernova remnants), at high energies the cosmic ray spectrum is dominated by these extragalactic cosmic rays. The exact energy at which the transition from galactic to extragalactic cosmic rays occurs is not clear, but it is in the range 1017 to 1018 eV.[1]
^Aloisio, R.; Berezinsky, V.; Gazizov, A. (December 2012). "Transition from galactic to extragalactic cosmic rays". Astroparticle Physics. 39–40: 129–143. arXiv:1211.0494. Bibcode:2012APh....39..129A. doi:10.1016/j.astropartphys.2012.09.007. S2CID 9266571.
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; Stecker, F. W. (2005). "Bulk Comptonization of the Cosmic Microwave Background by Extragalactic Jets as a Probe of Their Matter Content". The Astrophysical...
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Wibig, T.; Wolfendale, A. W. (2005). "At what particle energy do extragalacticcosmicrays start to predominate?". Journal of Physics G: Nuclear and Particle...
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