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An iced cosmic-ray macchiato

28 Jan 2020, 13:05 UTC
An iced cosmic-ray macchiato
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Title: Bottom-up Acceleration of Ultra-High-Energy Cosmic Rays in the Jets of Active Galactic NucleiAuthors: Rostom Mbarek, Damiano CaprioliFirst Author’s Institution: University of ChicagoStatus: Accepted to the Astrophysical Journal November 19, 2019 [open access]Our Universe is littered with particles of unbelievably high energy, called cosmic rays. The most extreme of these particles carry the same amount of energy as a professional tennis serve, like the Oh-My-God Particle detected nearly 30 years ago. The catch: we don’t know exactly what processes can pack so much energy into a single particle. The authors of today’s article discuss how these particles might gain their energy in a way analogous to your morning trip to Dunkin’.
Cosmic rays at a glanceCosmic rays are atomic nuclei that have been accelerated to high energies in astrophysical environments, such as supernova remnants or active galactic nuclei. Although they might seem like a great tool in the multi-messenger astronomy toolbox, astronomy with cosmic rays is no simple task, as they get deflected by extragalactic magnetic fields.Cosmic rays (red) consist of individual protons and nuclei of heavier elements. They are deflected by magnetic fields along their cosmological odysseys and can’t be used to point back to the place of their ...

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