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Constraints on Ultrahigh-Energy Cosmic-Ray Sources from a Search for Neutrinos above 10 PeV with IceCube
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2016 (Engelska)Ingår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, nr 24Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We report constraints on the sources of ultrahigh-energy cosmic rays (UHECRs) above 10(9) 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 x 10(5) GeV to above 10(11) GeV. Two neutrino-induced events with an estimated deposited energy of (2.6 +/- 0.3) x 10(6) GeV, the highest neutrino energy observed so far, and (7.7 +/- 2.0) x 10(5) GeV were detected. The atmospheric background-only hypothesis of detecting these events is rejected at 3.6 sigma. 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 gamma-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.

Ort, förlag, år, upplaga, sidor
2016. Vol. 117, nr 24
Nationell ämneskategori
Naturvetenskap
Forskningsämne
SWEDARP, IceCube
Identifikatorer
URN: urn:nbn:se:polar:diva-3387DOI: 10.1103/PhysRevLett.117.241101OAI: oai:DiVA.org:polar-3387DiVA, id: diva2:1075148
Forskningsfinansiär
PolarforskningssekretariatetTillgänglig från: 2017-02-17 Skapad: 2017-02-17 Senast uppdaterad: 2017-11-29Bibliografiskt granskad

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