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      Diffuse neutrinos from extragalactic supernova remnants: Dominating the 100 TeV IceCube flux

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          Abstract

          IceCube has measured a diffuse astrophysical flux of TeV-PeV neutrinos. The most plausible sources are unique high energy cosmic ray accelerators like hypernova remnants (HNRs) and remnants from gamma ray bursts in star-burst galaxies, which can produce primary cosmic rays with the required energies and abundance. In this case, however, ordinary supernova remnants (SNRs), which are far more abundant than HNRs, produce a comparable or larger neutrino flux in the ranges up to 100-150 TeV energies, implying a spectral break in the IceCube signal around these energies. The SNRs contribution in the diffuse flux up to these hundred TeV energies provides a natural baseline and then constrains the expected PeV flux.

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          Enhanced Cosmological GRB Rates and Implications for Cosmogenic Neutrinos

          Gamma-ray bursts, which are among the most violent events in the universe, are one of the few viable candidates to produce ultrahigh energy cosmic rays. Recently, observations have revealed that GRBs generally originate from metal-poor galaxies and do not directly trace cosmic star formation, as might have been assumed from their association with core-collapse supernovae. Several implications follow from these findings. The redshift distribution of observed GRBs is expected to peak at higher redshift (compared to cosmic star formation), which is supported by the mean redshift of the Swift GRB sample, ~3. If GRBs are, in fact, the source of the observed UHECR, then cosmic-ray production would evolve with redshift in a stronger fashion than has been previously suggested. This necessarily leads, through the GZK process, to an enhancement in the flux of cosmogenic neutrinos, providing a near-term approach for testing the gamma-ray burst-cosmic ray connection with ongoing and proposed UHE neutrino experiments.
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            Author and article information

            Journal
            2015-01-12
            2015-05-18
            Article
            10.1016/j.physletb.2015.04.032
            1501.02615
            0381555b-3b08-4ac4-a41d-27ce6432d69e

            http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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            Custom metadata
            0.1016/j.physletb.2015.04.032
            Phys.Lett. B745 (2015) 35-39
            12 pages, 2 figures, minor changes, comments and references added, matches the published version
            hep-ph astro-ph.HE

            High energy & Particle physics,High energy astrophysical phenomena
            High energy & Particle physics, High energy astrophysical phenomena

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