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Neutrinos from blazars

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arxiv 1912.03666 v1 pith:IF2UGNVJ submitted 2019-12-08 astro-ph.HE

classification astro-ph.HE
keywords blazarsblazarneutrinofirstflarehadronicjetsmodels
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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.

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  1. Characterization of a sample of $\gamma$-ray active galactic nuclei

    astro-ph.HE 2025-09 conditional novelty 5.0 of 10

    The paper classifies 64 radio-loud Fermi unassociated sources as blazars from their double-peaked SEDs, identifies 9-18 masquerading BL Lac candidates, and proposes new radio counterparts for 7 of 13 radio-quiet sources.

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