<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Zhang, B. Theodore</style></author><author><style face="normal" font="default" size="100%">Petropoulou, Maria</style></author><author><style face="normal" font="default" size="100%">Murase, Kohta</style></author><author><style face="normal" font="default" size="100%">Oikonomou, Foteini</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">A Neutral Beam Model for High-energy Neutrino Emission from the Blazar TXS 0506+056</style></title><short-title><style face="normal" font="default" size="100%">The Astrophysical Journal</style></short-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">1100</style></keyword><keyword><style  face="normal" font="default" size="100%">16</style></keyword><keyword><style  face="normal" font="default" size="100%">164</style></keyword><keyword><style  face="normal" font="default" size="100%">329</style></keyword><keyword><style  face="normal" font="default" size="100%">628</style></keyword><keyword><style  face="normal" font="default" size="100%">731</style></keyword><keyword><style  face="normal" font="default" size="100%">739</style></keyword><keyword><style  face="normal" font="default" size="100%">870</style></keyword><keyword><style  face="normal" font="default" size="100%">96</style></keyword><keyword><style  face="normal" font="default" size="100%">active galactic nuclei</style></keyword><keyword><style  face="normal" font="default" size="100%">Astrophysics - Astrophysics of Galaxies</style></keyword><keyword><style  face="normal" font="default" size="100%">Astrophysics - High Energy Astrophysical Phenomena</style></keyword><keyword><style  face="normal" font="default" size="100%">Blazars</style></keyword><keyword><style  face="normal" font="default" size="100%">cosmic rays</style></keyword><keyword><style  face="normal" font="default" size="100%">Gamma-ray astronomy</style></keyword><keyword><style  face="normal" font="default" size="100%">High energy astrophysics</style></keyword><keyword><style  face="normal" font="default" size="100%">High Energy Physics - Phenomenology</style></keyword><keyword><style  face="normal" font="default" size="100%">High-energy cosmic radiation</style></keyword><keyword><style  face="normal" font="default" size="100%">Jets</style></keyword><keyword><style  face="normal" font="default" size="100%">Neutrino astronomy</style></keyword><keyword><style  face="normal" font="default" size="100%">Particle astrophysics</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2020/02/1</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://ui.adsabs.harvard.edu/abs/2020ApJ...889..118Z</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">IOP</style></publisher><volume><style face="normal" font="default" size="100%">889</style></volume><pages><style face="normal" font="default" size="100%">118</style></pages><isbn><style face="normal" font="default" size="100%">0004-637X</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The IceCube collaboration reported an ∼3.5σ excess of 13 ± 5 neutrino events in the direction of the blazar TXS 0506+056 during an ∼6 month period in 2014-2015, as well as the (∼3σ) detection of a high-energy muon neutrino during an electromagnetic flare in 2017. We explore the possibility that the 2014-2015 neutrino excess and the 2017 multimessenger flare are both explained in a common physical framework that relies on the emergence of a relativistic neutral beam in the blazar jet due to interactions of accelerated cosmic rays (CRs) with photons. We demonstrate that the neutral beam model provides an explanation for the 2014-2015 neutrino excess without violating X-ray and γ-ray constraints and yields results consistent with the detection of one high-energy neutrino during the 2017 flare. If both neutrino associations with TXS 05065+056 are real, our model requires that (I) the composition of accelerated CRs is light, with a ratio of helium nuclei to protons ≳5; (II) a luminous external photon field (∼10&lt;SUP&gt;46&lt;/SUP&gt; erg s&lt;SUP&gt;-1&lt;/SUP&gt;) variable (on yearlong timescales) is present; and (III) the CR injection luminosity, as well as the properties of the dissipation region (I.e., Lorentz factor, magnetic field, and size), vary on yearlong timescales.</style></abstract></record></records></xml>