Thursday, 18 October 2018
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Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A

Added: 12.07.2018 20:08 | 3 views | 0 comments

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

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