Аннотация
Neutrinos are the most elusive particles in the Universe, capable of
traveling nearly unimpeded across it. Despite the vast amount of data
collected, a long standing and unsolved issue is still the association of
high-energy neutrinos with the astrophysical sources that originate them.
Amongst the candidate sources of neutrinos there are blazars, a class of
extragalactic sources powered by supermassive black holes that feed highly
relativistic jets, pointed towards the Earth. Previous studies appear
controversial, with several efforts claiming a tentative link between
high-energy neutrino events and individual blazars, and others putting into
question such relation. In this work we show that blazars are unambiguously
associated with high-energy astrophysical neutrinos at unprecedented level of
confidence, i.e. chance probability of 6 x 10^-7. Our statistical analysis
provides the observational evidence that blazars are astrophysical neutrino
factories and hence, extragalactic cosmic-ray accelerators.
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