Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A

Icecube Collaboration, Fermi-LAT collaboration, MAGIC Collaboration, AGILE, ASAS-SN, HAWC, H.E.S.S., INTEGRAL, Kanata, Kiso, and Subaru observing teams, Kapteyn, Liverpool telescope, Swift/NuSTAR, VERITAS, VLA/17B-403 team

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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 e290 tera-electron volts. Its arrival direction was consistent with the location of a known g-ray blazar, TXS 0506+056, observed to be in a flaring state. An extensive multiwavelength campaign followed, ranging from radio frequencies to g-rays. These observations characterize the variability and energetics of the blazar and include the detection of TXS 0506+056 in very-high-energy g-rays. This observation of a neutrino in spatial coincidence with a g-ray-emitting blazar during an active phase suggests that blazars may be a source of high-energy neutrinos.

Original languageEnglish
Article numbereaat1378
Issue number6398
Publication statusPublished - 13 Jul 2018
Externally publishedYes

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