Abstract
Observations of charged cosmic-rays, γ-rays and neutrino are possible thanks to the availability of new detectors coming from technologies typical of experimental particle physics. In conjunction with more traditional techniques used by astronomers, these multimessenger correlations of experimental data are opening a new scenario in astrophysics. We review some of the more recent developments in the field.
Highlights
The multimessenger inter-correlation between Cosmic Rays (CRs), γ-rays and neutrinos is of fundamental importance for a deeper comprehension of high energy (HE) processes in astrophysical sources
The main detection signatures for neutrinos in a Neutrino Telescope are long, straight tracks and approximately spherical cascades. The former are created by neutrino-induced muons while the latter are produced by neutrino-induced electromagnetic and/or hadronic showers
Multimessenger astrophysics becomes more and more important to obtain a complete picture of non-thermal processes in the Universe
Summary
The multimessenger inter-correlation between Cosmic Rays (CRs), γ-rays and neutrinos is of fundamental importance for a deeper comprehension of high energy (HE) processes in astrophysical sources. The highest energy CRs are probably originated from extragalactic sources If they are protons with E > 5 × 1019 eV, they could interact with the cosmic microwave background radiation. The prediction of a diffuse flux of HE neutrino of extra-galactic origin is a direct consequence of the ultra HE CR observations This connection between CRs, neutrinos and γ-rays was used to put upper bounds on the expected neutrino flux from extragalactic sources, since the neutrino energy generation rate will never exceed the generation rate of high energy protons. The positron fraction spectrum exhibits no spatial anisotropy, structures or time dependence The AMS-02 experiment will undoubtedly be the leading experiment for a systematic study of the CRs through direct measurements, for the searches of antimatter in space, and for the searches for particles originated by Dark Matter annihilations
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