Neutrinos from blazars

Abstract

The evidence for joint gamma and neutrino emission from the blazar TXS 0506+056 has renewed interest in blazars as neutrino sources. The detection of neutrinos from blazars can be seen as the smoking gun for the presence of relativistic protons in blazar's jets, and can thus help identify blazars, and active galactic nuclei in general, as cosmic-ray accelerators. In this contribution I first introduce blazars and blazar hadronic models, and then present the results of the multi-messenger modeling of both the 2017 gamma-neutrino flare, and the 2014-2015 neutrino-only flare of TXS 0506+056. For the first time it is possible to constrain blazar hadronic models using the information from neutrino detectors, and I discuss the implications of these neutrino observations on our understanding of the physics of relativistic jets from super-massive black-holes.

8 pages; invited plenary contribution to appear in the proceedings of the TAUP 2019 conference (Toyama, September 9-13, 2019)

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Cited by in corpus (8)

• Directional association of TeV to PeV astrophysical neutrinos with radio blazars
• Particle acceleration by relativistic magnetic reconnection driven by kink instability turbulence in Poynting flux dominated jets
• Constraints on the models of the origin of high-energy astrophysical neutrinos
• Carpet-2 search for gamma rays above 100 TeV in coincidence with HAWC and IceCube alerts
• Neutrino production in blazar radio cores
• Multi-messenger emission from magnetic reconnection in blazar jets: the case of TXS 0506+056
• Hunting for neutrino emission from multi-frequency variable sources
• Search for the multiwavelength counterparts to extragalactic unassociated Fermi γ-ray sources