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Title: Angular correlation of cosmic neutrinos with ultrahigh-energy cosmic rays and implications for their sources

Abstract

Cosmic neutrino events detected by the IceCube Neutrino Observatory with energy 0∼> 3 TeV have poor angular resolutions to reveal their origin. Ultrahigh-energy cosmic rays (UHECRs), with better angular resolutions at 0>6 EeV energies, can be used to check if the same astrophysical sources are responsible for producing both neutrinos and UHECRs. We test this hypothesis, with statistical methods which emphasize invariant quantities, by using data from the Pierre Auger Observatory, Telescope Array and past cosmic-ray experiments. We find that the arrival directions of the cosmic neutrinos are correlated with 0≥ 10 EeV UHECR arrival directions at confidence level ≈ 90%. The strength of the correlation decreases with decreasing UHECR energy and no correlation exists at energy 0∼ 6 EeV . A search in astrophysical databases within 3{sup o} of the arrival directions of UHECRs with energy 0≥ 10 EeV, that are correlated with the IceCube cosmic neutrinos, resulted in 18 sources from the Swift-BAT X-ray catalog with redshift z≤ 0.06. We also found 3 objects in the Kühr catalog of radio sources using the same criteria. The sources are dominantly Seyfert galaxies with Cygnus A being the most prominent member. We calculate the required neutrino and UHECR fluxes to produce the observed correlated events, andmore » estimate the corresponding neutrino luminosity (25 TeV–2.2 PeV) and cosmic-ray luminosity (500 TeV–180 EeV), assuming the sources are the ones we found in the Swift-BAT and Kühr catalogs. We compare these luminosities with the X-ray luminosity of the corresponding sources and discuss possibilities of accelerating protons to 0∼> 10 EeV and produce neutrinos in these sources.« less

Authors:
;  [1]
  1. Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park 2006 (South Africa)
Publication Date:
OSTI Identifier:
22525616
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR CORRELATION; ASTROPHYSICS; CATALOGS; COMPARATIVE EVALUATIONS; COSMIC NEUTRINOS; COSMIC X-RAY SOURCES; EEV RANGE; LUMINOSITY; PEV RANGE; PROTONS; RED SHIFT; RESOLUTION; SEYFERT GALAXIES; TELESCOPES; TEV RANGE; X RADIATION

Citation Formats

Moharana, Reetanjali, and Razzaque, Soebur. Angular correlation of cosmic neutrinos with ultrahigh-energy cosmic rays and implications for their sources. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/08/014.
Moharana, Reetanjali, & Razzaque, Soebur. Angular correlation of cosmic neutrinos with ultrahigh-energy cosmic rays and implications for their sources. United States. https://doi.org/10.1088/1475-7516/2015/08/014
Moharana, Reetanjali, and Razzaque, Soebur. Sat . "Angular correlation of cosmic neutrinos with ultrahigh-energy cosmic rays and implications for their sources". United States. https://doi.org/10.1088/1475-7516/2015/08/014.
@article{osti_22525616,
title = {Angular correlation of cosmic neutrinos with ultrahigh-energy cosmic rays and implications for their sources},
author = {Moharana, Reetanjali and Razzaque, Soebur},
abstractNote = {Cosmic neutrino events detected by the IceCube Neutrino Observatory with energy 0∼> 3 TeV have poor angular resolutions to reveal their origin. Ultrahigh-energy cosmic rays (UHECRs), with better angular resolutions at 0>6 EeV energies, can be used to check if the same astrophysical sources are responsible for producing both neutrinos and UHECRs. We test this hypothesis, with statistical methods which emphasize invariant quantities, by using data from the Pierre Auger Observatory, Telescope Array and past cosmic-ray experiments. We find that the arrival directions of the cosmic neutrinos are correlated with 0≥ 10 EeV UHECR arrival directions at confidence level ≈ 90%. The strength of the correlation decreases with decreasing UHECR energy and no correlation exists at energy 0∼ 6 EeV . A search in astrophysical databases within 3{sup o} of the arrival directions of UHECRs with energy 0≥ 10 EeV, that are correlated with the IceCube cosmic neutrinos, resulted in 18 sources from the Swift-BAT X-ray catalog with redshift z≤ 0.06. We also found 3 objects in the Kühr catalog of radio sources using the same criteria. The sources are dominantly Seyfert galaxies with Cygnus A being the most prominent member. We calculate the required neutrino and UHECR fluxes to produce the observed correlated events, and estimate the corresponding neutrino luminosity (25 TeV–2.2 PeV) and cosmic-ray luminosity (500 TeV–180 EeV), assuming the sources are the ones we found in the Swift-BAT and Kühr catalogs. We compare these luminosities with the X-ray luminosity of the corresponding sources and discuss possibilities of accelerating protons to 0∼> 10 EeV and produce neutrinos in these sources.},
doi = {10.1088/1475-7516/2015/08/014},
url = {https://www.osti.gov/biblio/22525616}, journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 08,
volume = 2015,
place = {United States},
year = {2015},
month = {8}
}