%0 Journal Article
%A Domínguez Díaz, Alberto
%A Barrio Uña, Juan Abel
%A Contreras González, José Luis
%A Fonseca González, María Victoria
%A López Moya, Marcos
%A Nievas Rosillo, Mireia
%A Fidalgo, David
%A Sivakoff, Gregory
%T Multimessenger observations of a flaring blazar coincident with high-energy neutrino IceCube-170922A
%D 2018
%@ 0036-8075
%U https://hdl.handle.net/20.500.14352/100948
%X Neutrino emission from a flaring blazar Neutrinos interact only very weakly with matter, but giant detectors have succeeded in detecting small numbers of astrophysical neutrinos. Aside from a diffuse background, only two individual sources have been identified: the Sun and a nearby supernova in 1987. A multiteam collaboration detected a high-energy neutrino event whose arrival direction was consistent with a known blazar—a type of quasar with a relativistic jet oriented directly along our line of sight. The blazar, TXS 0506+056, was found to be undergoing a gamma-ray flare, prompting an extensive multiwavelength campaign. Motivated by this discovery, the IceCube collaboration examined lower-energy neutrinos detected over the previous several years, finding an excess emission at the location of the blazar. Thus, blazars are a source of astrophysical neutrinos.
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