TY  - JOUR
AU  - Keivani, A.
AU  - Murase, K.
AU  - Petropoulou, M.
AU  - Fox, D. B.
AU  - Cenko, S. B.
AU  - Chaty, S.
AU  - Coleiro, A.
AU  - DeLaunay, J. J.
AU  - Dimitrakoudis, S.
AU  - Evans, P. A.
AU  - Kennea, J. A.
AU  - Marshall, F. E.
AU  - Mastichiadis, A.
AU  - Osborne, J. P.
AU  - Santander, M.
AU  - Tohuvavohu, A.
AU  - Turley, C. F.
PY  - 2018
DA  - 2018//
TI  - A Multimessenger Picture of the Flaring Blazar TXS 0506+056: Implications for High-energy Neutrino Emission and Cosmic-Ray Acceleration
T2  - Astrophys. J.
JO  - Astrophysical Journal
SP  - 84 - 16pp
VL  - 864
IS  - 1
PB  - Iop Publishing Ltd
KW  - Lacertae objects: general
KW  - BL Lacertae objects: individual (TXS 0506+056)
KW  - galaxies: active
KW  - gamma rays: galaxies
KW  - neutrinos
KW  - radiation mechanisms: non-thermal
AB  - 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.
SN  - 0004-637x
UR  - http://arxiv.org/abs/1807.04537
UR  - https://doi.org/10.3847/1538-4357/aad59a
DO  - 10.3847/1538-4357/aad59a
LA  - English
N1  - WOS:000443293800010
ID  - Keivani_etal2018
ER  -