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arXiv · 1807.04335

Lepto-hadronic single-zone models for the electromagnetic and neutrino emission of TXS 0506+056

M. Cerruti·A. Zech·C. Boisson·G. Emery·S. Inoue·J. -P. Lenain
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Abstract

While active galactic nuclei with relativistic jets have long been prime candidates for the origin of extragalactic cosmic rays and neutrinos, the BL Lac object TXS 0506+056 is the first astrophysical source observed to be associated with some confidence ($\sim 3σ$) with a high-energy neutrino, IceCube-170922A, detected by the IceCube Observatory. The source was found to be active in high-energy gamma-rays with Fermi-LAT and in very-high-energy gamma-rays with the MAGIC telescopes. To consistently explain the observed neutrino and multi-wavelength electromagnetic emission of TXS 0506+056, we investigate in detail single-zone models of lepto-hadronic emission, assuming co-spatial acceleration of electrons and protons in the jet, and synchrotron photons from the electrons as targets for photo-hadronic neutrino production. The parameter space concerning the physical conditions of the emission region and particle populations is extensively explored for scenarios where the gamma-rays are dominated by either 1) proton synchrotron emission or 2) synchrotron-self-Compton emission, with a subdominant but non-negligible contribution from photo-hadronic cascades in both cases. We find that the latter can be compatible with the neutrino observations, while the former is strongly disfavoured due to the insufficient neutrino production rate.

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M. Cerruti, A. Zech, C. Boisson, G. Emery, S. Inoue, J. -P. Lenain. 2018-11-08. Lepto-hadronic single-zone models for the electromagnetic and neutrino emission of TXS 0506+056. https://doi.org/10.1093/mnrasl%2Fsly210

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