TY  - JOUR
A1  - Liu, Ruo-Yu
A1  - Wang, Kai
A1  - Xue, Rui
A1  - Taylor, Andrew M.
A1  - Wang, Xiang-Yu
A1  - Li, Zhuo
A1  - Yan, Huirong
T1  - Hadronuclear interpretation of a high-energy neutrino event coincident with a blazar flare
JF  - Physical review : D, Particles, fields, gravitation, and cosmology
N2  - Although many high-energy neutrinos detected by the IceCube telescope are believed to have an extraterrestrial origin, their astrophysical sources remain a mystery. Recently, an unprecedented discovery of a high-energy muon neutrino event coincident with a multiwavelength flare from a blazar, TXS 0506 + 056, shed some light on the origin of the neutrinos. It is usually believed that a blazar is produced by a relativistic jet launched from an accreting supermassive black hole (SMBH). Here, we show that the high-energy neutrino event can be interpreted by the inelastic hadronuclear interactions between the accelerated cosmic-ray protons in the relativistic jet and the dense gas clouds in the vicinity of the SMBH. Such a scenario only requires a moderate proton power in the jet, which could be much smaller than that required in the conventional hadronic model which instead calls upon the photomeson process. Meanwhile, the flux of the multiwavelength flare from the optical to gamma-ray band can be well explained by invoking a second radiation zone in the jet at a larger distance to the SMBH. In our model, the neutrino emission lasts a shorter time than the multiwavelength flare, so the neutrino event is not necessarily correlated with the flare, but it is probably accompanied by a spectrum hardening above a few giga-electron-volt (GeV).
Y1  - 2019
U6  - https://doi.org/10.1103/PhysRevD.99.063008
SN  - 2470-0010
SN  - 2470-0029
VL  - 99
IS  - 6
PB  - American Physical Society
CY  - Melville
ER  -