Nearby low-luminosity active galactic nuclei with radiatively inefficient accretion flows should emit detectable MeV gamma rays and TeV-PeV neutrinos for future instruments, provided protons are accelerated with the assumed efficiencies.
Demystifying the PeV Cascades in IceCube: Less (Energy) is More (Events)
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abstract
The IceCube neutrino observatory has detected two cascade events with energies near 1 PeV. Without invoking new physics, we analyze the source of these neutrinos. We show that atmospheric conventional neutrinos and cosmogenic neutrinos (those produced in the propagation of ultra-high- energy cosmic rays) are strongly disfavored. For atmospheric prompt neutrinos or a diffuse background of neutrinos produced in astrophysical objects, the situation is less clear. We show that there are tensions with observed data, but that the details depend on the least-known aspects of the IceCube analysis. Very likely, prompt neutrinos are disfavored and astrophysical neutrinos are plausible. We demonstrate that the fastest way to reveal the origin of the observed PeV neutrinos is to search for neutrino cascades in the range below 1 PeV, for which dedicated analyses with high sensitivity have yet to appear, and where many more events could be found.
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Multi-messenger tests of cosmic-ray acceleration in radiatively inefficient accretion flows
Nearby low-luminosity active galactic nuclei with radiatively inefficient accretion flows should emit detectable MeV gamma rays and TeV-PeV neutrinos for future instruments, provided protons are accelerated with the assumed efficiencies.