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|Title:||Constraints on ultrahigh-energy cosmic-ray sources from a search for neutrinos above 10 PeV with IceCube|
|Citation:||Physical Review Letters, 2016; 117(24):241101-1-241101-9|
|Publisher:||American Physical Society|
|M.G. Aartsen ... G.C. Hill ... S. Robertson ... A. Wallace ... B.J. Whelan ... et al. [The IceCube Collaboration]|
|Abstract:||We report constraints on the sources of ultrahigh-energy cosmic rays (UHECRs) above 10⁹ GeV, based on an analysis of seven years of IceCube data. This analysis efficiently selects very high- energy neutrino-induced events which have deposited energies from 5×10⁵ GeV to above 10¹¹ GeV. Two neutrino-induced events with an estimated deposited energy of (2.6±0.3)×10⁶ GeV, the highest neutrino energy observed so far, and (7.7±2.0)×10⁵ GeV were detected. The atmospheric background-only hypothesis of detecting these events is rejected at 3.6σ. The hypothesis that the observed events are of cosmogenic origin is also rejected at >99% CL because of the limited deposited energy and the nonobservation of events at higher energy, while their observation is consistent with an astrophysical origin. Our limits on cosmogenic neutrino fluxes disfavor the UHECR sources having a cosmological evolution stronger than the star formation rate, e.g., active galactic nuclei and γ-ray bursts, assuming proton-dominated UHECRs. Constraints on UHECR sources including mixed and heavy UHECR compositions are obtained for models of neutrino production within UHECR sources. Our limit disfavors a significant part of parameter space for active galactic nuclei and new-born pulsar models. These limits on the ultrahigh-energy neutrino flux models are the most stringent to date.|
|Rights:||© 2016 American Physical Society|
|Appears in Collections:||Physics publications|
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