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MULTI-MESSENGER ASTRONOMY

Cosmic hadron colliders

An ultrahigh-energy neutrino event detected with the IceCube detector in Antarctica, simultaneous and co-spatial with a multi-wavelength outburst of a blazar about 3 billion light years away, points unambiguously to lepto-hadronic cooling mechanisms in jetted active galactic nuclei.

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Correspondence to Elena Pian.

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Fig. 1: Artist impression of an active galactic nucleus producing highly energetic particles.