MG15 - Talk detail

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Abstract

The long-time efforts invested in the neutrino astronomy field have recently paid off by the discovery of a diffuse neutrino flux of astrophysical origin by the IceCube detector. The incontrovertible evidence of the existence of cosmic sources producing neutrinos has brought up new questions in astroparticle physics, and opened the quest for the identification of those emitters. While neutrino astronomy is becoming a helpful means of investigation, a lot can be learnt by using it in synergy with other mature probes. In particular, gamma rays have already demonstrated being an invaluable player in the multi-messenger era. The combination of the neutrino/gamma-ray information is a relatively novel technique, built on the suspicion that both radiations can be pictured in the same particle-cascades scenario, cascades that are ultimately originated by cosmic rays. I will present how, based on these assumptions, limits can be placed on the known astrophysical source classes contribution to the diffuse neutrino flux. Furthermore, a promising ground for discovery is the search for transient neutrino/gamma-ray sources, in which case the atmospheric neutrino and muon backgrounds can be reduced by taking time- and space-coincidence. I will discuss a suggestive hint in this direction that happened on September 22, 2017 when the IceCube detector observed a high-energy TeV neutrino with 50% probability of being of astrophysical origin and shortly after the alert, the Fermi-LAT reported the detection of gamma-ray emission from a flaring blazar, positionally consistent with the neutrino event.

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