Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

The Pierre Auger Collaboration, The IceCube collaboration, The Telescope Array Collaboration

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

This paper presents the results of different searches for correlations between very high-energy neutrino candidates detected by IceCube and the highest-energy cosmic rays measured by the Pierre Auger Observatory and the Telescope Array. We first consider samples of cascade neutrino events and of high-energy neutrino-induced muon tracks, which provided evidence for a neutrino flux of astrophysical origin, and study their cross-correlation with the ultrahigh-energy cosmic ray (UHECR) samples as a function of angular separation. We also study their possible directional correlations using a likelihood method stacking the neutrino arrival directions and adopting different assumptions on the size of the UHECR magnetic deflections. Finally, we perform another likelihood analysis stacking the UHECR directions and using a sample of through-going muon tracks optimized for neutrino point-source searches with sub-degree angular resolution. No indications of correlations at discovery level are obtained for any of the searches performed. The smallest of the p-values comes from the search for correlation between UHECRs with IceCube high-energy cascades, a result that should continue to be monitored.

Original languageEnglish
Article number37
JournalJournal of Cosmology and Astroparticle Physics
Volume2016
Issue number1
DOIs
Publication statusPublished - 2016 Jan 20

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arrivals
cosmic rays
observatories
neutrinos
telescopes
energy
muons
cascades
angular resolution
cross correlation
point sources
deflection
astrophysics
indication

Keywords

  • cosmic ray experiments
  • neutrino astronomy
  • neutrino experiments
  • ultra high energy cosmic rays

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array. / The Pierre Auger Collaboration; The IceCube collaboration; The Telescope Array Collaboration.

In: Journal of Cosmology and Astroparticle Physics, Vol. 2016, No. 1, 37, 20.01.2016.

Research output: Contribution to journalArticle

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abstract = "This paper presents the results of different searches for correlations between very high-energy neutrino candidates detected by IceCube and the highest-energy cosmic rays measured by the Pierre Auger Observatory and the Telescope Array. We first consider samples of cascade neutrino events and of high-energy neutrino-induced muon tracks, which provided evidence for a neutrino flux of astrophysical origin, and study their cross-correlation with the ultrahigh-energy cosmic ray (UHECR) samples as a function of angular separation. We also study their possible directional correlations using a likelihood method stacking the neutrino arrival directions and adopting different assumptions on the size of the UHECR magnetic deflections. Finally, we perform another likelihood analysis stacking the UHECR directions and using a sample of through-going muon tracks optimized for neutrino point-source searches with sub-degree angular resolution. No indications of correlations at discovery level are obtained for any of the searches performed. The smallest of the p-values comes from the search for correlation between UHECRs with IceCube high-energy cascades, a result that should continue to be monitored.",
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