A Bayesian approach to modelling multi-messenger emission from blazars using lepto-hadronic kinetic equations

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Abstract

Blazar TXS 0506+056 is the main candidate for a coincident neutrino and gamma-ray flare event. In this paper, we present a detailed kinetic lepto-hadronic emission model capable of producing a photon and neutrino spectrum given a set of parameters. Our model includes a range of large-scale geometries and both dynamical and steady-state injection models for electrons and protons.We link this model with a Markov chain Monte Carlo sampler to obtain a powerful statistical tool that allows us to both fit the Spectral Energy Distribution and study the probability density functions and correlations of the parameters. Assuming a fiducial neutrino flux, we demonstrate how multimessenger observations can be modelled jointly in a Bayesian framework. We find the best parameters for each of the variants of the model tested and report on their cross-correlations. Additionally, we confirm that reproducing the neutrino flux of TXS 0506+056 requires an extreme proton to electron ratio either in the local acceleration process or from external injection.

Original languageEnglish
Pages (from-to)3613-3630
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume500
Issue number3
Early online date27 Nov 2020
DOIs
Publication statusPublished - 1 Jan 2021

Keywords

  • BL Lacertae objects: Individual: TXS 0506+056
  • Methods: Statistical
  • Neutrinos
  • Radiation mechanisms: non-thermal

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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