%0 Journal Article
%T A Multimessenger Picture of the Flaring Blazar TXS 0506+056: Implications for High-energy Neutrino Emission and Cosmic-Ray Acceleration
%A Keivani, A.
%A Murase, K.
%A Petropoulou, M.
%A Fox, D. B.
%A Cenko, S. B.
%A Chaty, S.
%A Coleiro, A.
%A DeLaunay, J. J.
%A Dimitrakoudis, S.
%A Evans, P. A.
%A Kennea, J. A.
%A Marshall, F. E.
%A Mastichiadis, A.
%A Osborne, J. P.
%A Santander, M.
%A Tohuvavohu, A.
%A Turley, C. F.
%J Astrophysical Journal
%D 2018
%V 864
%N 1
%I Iop Publishing Ltd
%@ 0004-637x
%G English
%F Keivani_etal2018
%O WOS:000443293800010
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3708), last updated on Wed, 12 Sep 2018 10:00:24 +0000
%X Detection of the IceCube-170922A neutrino coincident with the flaring blazar TXS 0506+056, the first and only similar to 3 sigma high-energy neutrino source association to date, offers a potential breakthrough in our understanding of high-energy cosmic particles and blazar physics. We present a comprehensive analysis of TXS. 0506+056 during its flaring state, using newly collected Swift, NuSTAR, and X-shooter data with Fermi observations and numerical models to constrain the blazar's particle acceleration processes and multimessenger (electromagnetic (EM) and high-energy neutrino) emissions. Accounting properly for EM cascades in the emission region, we find a physically consistent picture only within a hybrid leptonic scenario, with gamma-rays produced by external inverse-Compton processes and high-energy neutrinos via a radiatively subdominant hadronic component. We derive robust constraints on the blazar's neutrino and cosmic-ray emissions and demonstrate that, because of cascade effects, the 0.1-100 keV emissions of TXS. 0506+056 serve as a better probe of its hadronic acceleration and highenergy neutrino production processes than its GeV-TeV emissions. If the IceCube neutrino association holds, physical conditions in the TXS. 0506+056 jet must be close to optimal for high-energy neutrino production, and are not favorable for ultrahigh-energy cosmic-ray acceleration. Alternatively, the challenges we identify in generating a significant rate of IceCube neutrino detections from TXS. 0506+056 may disfavor single-zone models, in which.-rays and high-energy neutrinos are produced in a single emission region. In concert with continued operations of the high-energy neutrino observatories, we advocate regular X-ray monitoring of TXS. 0506+056 and other blazars in order to test single-zone blazar emission models, clarify the nature and extent of their hadronic acceleration processes, and carry out the most sensitive possible search for additional multimessenger sources.
%K Lacertae objects: general
%K BL Lacertae objects: individual (TXS 0506+056)
%K galaxies: active
%K gamma rays: galaxies
%K neutrinos
%K radiation mechanisms: non-thermal
%R 10.3847/1538-4357/aad59a
%U http://arxiv.org/abs/1807.04537
%U https://doi.org/10.3847/1538-4357/aad59a
%P 84 - 16pp