2018
DOI: 10.1126/science.aat1378
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Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A

Abstract: Previous detections of individual astrophysical sources of neutrinos are limited to the Sun and the supernova 1987A, whereas the origins of the diffuse flux of high-energy cosmic neutrinos remain unidentified. On 22 September 2017, we detected a high-energy neutrino, IceCube-170922A, with an energy of ~290 tera-electron volts. Its arrival direction was consistent with the location of a known γ-ray blazar, TXS 0506+056, observed to be in a flaring state. An extensive multiwavelength campaign followed, ranging f… Show more

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Cited by 833 publications
(549 citation statements)
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“…On the other hand, the data from Fermi reveals enhanced gamma-ray activity of TXS0506+056 lasting several months. We consider physical models of the source that are compatible with the detection of one neutrino by IceCube during 0.5 years in the energy range reported in Aartsen et al (2018). By invoking a dense field of low-energy photons originating outside of the jet as targets for photohadronic interactions, the measured neutrino event can be interpreted consistently with the EM observations.…”
Section: Introductionsupporting
confidence: 49%
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“…On the other hand, the data from Fermi reveals enhanced gamma-ray activity of TXS0506+056 lasting several months. We consider physical models of the source that are compatible with the detection of one neutrino by IceCube during 0.5 years in the energy range reported in Aartsen et al (2018). By invoking a dense field of low-energy photons originating outside of the jet as targets for photohadronic interactions, the measured neutrino event can be interpreted consistently with the EM observations.…”
Section: Introductionsupporting
confidence: 49%
“…lower and upper limits being 183 TeV (200 TeV) and 4.3 PeV (7.5 PeV), respectively, assuming a spectral index of −2.13 (−2.0) for the diffuse astrophysical muon neutrino spectrum (Aartsen et al 2014). No additional excess of neutrinos with lower energy was found from the direction of TXS0506+056 near the time of the alert (Aartsen et al 2018).…”
Section: Introductionmentioning
confidence: 99%
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