@Article{Keivani_etal2018,
author="Keivani, A.
and Murase, K.
and Petropoulou, M.
and Fox, D. B.
and Cenko, S. B.
and Chaty, S.
and Coleiro, A.
and DeLaunay, J. J.
and Dimitrakoudis, S.
and Evans, P. A.
and Kennea, J. A.
and Marshall, F. E.
and Mastichiadis, A.
and Osborne, J. P.
and Santander, M.
and Tohuvavohu, A.
and Turley, C. F.",
title="A Multimessenger Picture of the Flaring Blazar TXS 0506+056: Implications for High-energy Neutrino Emission and Cosmic-Ray Acceleration",
journal="Astrophysical Journal",
year="2018",
publisher="Iop Publishing Ltd",
volume="864",
number="1",
pages="84 - 16pp",
optkeywords="Lacertae objects: general; BL Lacertae objects: individual (TXS 0506+056); galaxies: active; gamma rays: galaxies; neutrinos; radiation mechanisms: non-thermal",
abstract="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{\textquoteright}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{\textquoteright}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.",
optnote="WOS:000443293800010",
optnote="exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3708), last updated on Wed, 12 Sep 2018 10:00:24 +0000",
issn="0004-637x",
doi="10.3847/1538-4357/aad59a",
opturl="http://arxiv.org/abs/1807.04537",
opturl="https://doi.org/10.3847/1538-4357/aad59a",
archivePrefix="arXiv",
eprint="1807.04537",
language="English"
}