HE2 - High Energy Astrophysical neutrinos detection |
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Speaker |
Wang, Xiangyu |
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Coauthors |
Ruo-Yu Liu, Xiang-Yu Wang, Susumu Inoue, Roland Crocker, Felix Aharonian |
| Talk Title |
Hypernova remnants in star-forming galaxies as the origin of IceCube PeV neutrinos |
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Abstract |
We argue that the excess of sub-PeV/PeV neutrinos recently reported by IceCube could plausibly originate through pion-production processes in the same sources responsible for cosmic rays (CRs) with energy above the second knee around 10^18 eV. The pion-production efficiency for escaping CRs that produce PeV neutrinos is required to be ≳ 0.1 in such sources. On the basis of current data, we identify semirelativistic hypernova remnants as possible sources that satisfy the requirements. By virtue of their fast ejecta, such objects can accelerate protons to EeV energies, which, in turn, can interact with the dense surrounding medium during propagation in their host galaxies to produce sufficient high-energy neutrinos via proton-proton (pp) collisions. Their accompanying gamma-ray flux can remain below the diffuse isotropic gamma-ray background observed by the Fermi Large Area Telescope. |
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