Abstract
The completed IceCube Observatory, the first km^3 neutrino telescope, is already providing the most stringent limits on the flux of high energy cosmic neutrinos from point-like and diffuse galactic and extra-galactic sources. The non-detection of extra-terrestrial neutrinos has important consequences on the origin of the cosmic rays. Here the current status of astrophysical neutrino searches, and of the observation of a persistent cosmic ray anisotropy above 100 TeV, are reviewed.
Highlights
One hundred years after their discovery, the origin of the cosmic rays is still a mystery
In this case Supernova Remnants (SNRs) in our Galaxy could be the major source of cosmic rays up to about 1015 ÷1017 eV
Of the events that trigger IceCube, the vast majority are muon bundles produced by the impact of primary cosmic rays in the atmosphere
Summary
One hundred years after their discovery, the origin of the cosmic rays is still a mystery. The detection of an extended emission of TeV γ-rays from the Galactic Center by H.E.S.S., which is attributed to cosmic rays accelerated by SNR G0.9+0.1 interacting with the surrounding clouds, might provide the first evidence of hadronic acceleration [2]. The construction of IceCube started in 2004 and physics quality data taking commenced in 2006 With this early data the observatory is providing the most stringent limits on the flux of high energy neutrinos from extra-terrestrial origin, and strong constraints on the models of individual sources of cosmic rays and unidentified diffuse sources. On the other hand the complex energy-dependent topology suggests that non-diffusive processes in the local interstellar medium most probably play an important role
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