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Coincidence of a high-fluence blazar outburst with a PeV-energy neutrino event


Kadler, M and Krauss, F and Mannheim, K and Ojha, R and Muller, C and Schulz, R and Anton, G and Baumgartner, W and Beuchert, T and Buson, S and Carpenter, B and Eberl, T and Edwards, PG and Eisenacher Glawion, D and Elsasser, D and Gehrels, N and Grafe, C and Gulyaev, S and Hase, H and Horiuchi, S and James, CW and Kappes, A and Kappes, A and Katz, U and Kreikenbohm, A and Kreter, M and Kreykenbohm, I and Langejahn, M and Leiter, K and Litzinger, E and Longo, F and Lovell, JEJ and McEnery, J and Natusch, T and Phillips, C and Plotz, C and Quick, J and Ros, E and Stecker, FW and Steinbring, T and Stevens, J and Thompson, DJ and Trustedt, J and Tzioumis, AK and Weston, S and Wilms, J and Zensus, JA, Coincidence of a high-fluence blazar outburst with a PeV-energy neutrino event, Nature Physics, 12, (8) pp. 807-814. ISSN 1745-2473 (2016) [Refereed Article]


Copyright Statement

Copyright 2016 Nature Publishing Group

DOI: doi:10.1038/nphys3715


The astrophysical sources of the extraterrestrial, very high-energy neutrinos detected by the IceCube collaboration remain to be identified. Gamma-ray (γ-ray) blazars have been predicted to yield a cumulative neutrino signal exceeding the atmospheric background above energies of 100 TeV, assuming that both the neutrinos and the 3-ray photons are produced by accelerated protons in relativistic jets. As the background spectrum falls steeply with increasing energy, the individual events with the clearest signature of being of extraterrestrial origin are those at petaelectronvolt energies. Inside the large positional-uncertainty fields of the first two petaelectronvolt neutrinos detected by IceCube, the integrated emission of the blazar population has a sufficiently high electromagnetic flux to explain the detected IceCube events, but fluences of individual objects are too low to make an unambiguous source association. Here, we report that a major outburst of the blazar PKS B1424-418 occurred in temporal and positional coincidence with a third petaelectronvolt-energy neutrino event (HESE-35) detected by IceCube. On the basis of an analysis of the full sample of γ-ray blazars in the HESE-35 field, we show that the long-term average γ-ray emission of blazars as a class is in agreement with both the measured all-sky flux of petaelectronvolt neutrinos and the spectral slope of the IceCube signal. The outburst of PKS B1424-418 provides an energy output high enough to explain the observed petaelectronvolt event, suggestive of a direct physical association.

Item Details

Item Type:Refereed Article
Keywords:high-fluence blazar outburst, PeV-energy, neutrino event
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:118265
Year Published:2016
Web of Science® Times Cited:138
Deposited By:Mathematics and Physics
Deposited On:2017-07-07
Last Modified:2018-06-29
Downloads:151 View Download Statistics

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