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Fig. 8.


One-zone lepto-hadronic models (left panel) and the predicted neutrino flux (right panel) for 13 June 2016. The definition of symbols and lines in the SED model in the left panel is the same as Fig. 7. The higher energy peak in the SED in this case, is a combination of the SSC and photo-meson cascade component which can be achieved with B ∼ 1 G, Ep, max >  1016 eV at the cost of high jet power Lj >  1048 erg s−1 (≫LEdd). The meaning of the different curves in the neutrino spectra (right panel) is mentioned in the legend. The IceCube sensitivity curve is taken from IceCube Collaboration (2019) corresponding to declination 60°. Neutrino spectra predicted in the proton-synchrotron solutions of Fig. 7 peak at very high energies and provide low neutrino flux in the range 0.1–100 PeV. The neutrino peak is shifted to lower energies in the lepto-hadronic solutions providing slightly higher flux at the cost of very high values of the jet luminosity. For more details see the discussion in Sect. 4.3.3 and the parameters in Table 4.

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