A self-consistent leptonic-hadronic interpretation of the electromagnetic and neutrino emissions from blazar TXS 0506+056

TL;DR

This paper develops a self-consistent leptonic-hadronic model to explain electromagnetic and neutrino emissions from blazar TXS 0506+056, providing a better fit to observations than previous models and supporting the association with IceCube-170922A.

Contribution

It introduces a hybrid leptonic-hadronic model that self-consistently accounts for particle acceleration and radiative processes, improving the explanation of multi-messenger emissions from the blazar.

Findings

The hybrid model better reproduces the X-ray and gamma-ray spectra.

The predicted neutrino spectrum aligns more closely with observations.

The model supports the association between the blazar and the neutrino event.

Abstract

The potential association between the blazar TXS 0506+056 and the neutrino event IceCube-170922A provides a unique opportunity to study the possible physical connection between the high-energy photons and neutrinos. We explore the correlated electromagnetic and neutrino emissions of blazar TXS 0506+056 by a self-consistent leptonic-hadronic model, taking into account particle stochastic acceleration and all relevant radiative processes self-consistently. The electromagnetic and neutrino spectra of blazar TXS 0506+056 are reproduced by the proton synchrotron and hybrid leptonic-hadronic models based on the proton-photon interactions. It is found that the hybrid leptonic-hadronic model can be used to better explain the observed X-ray and $\gamma$-ray spectra of blazar TXS 0506+056 than the proton synchrotron model. Moreover, the predicted neutrino spectrum of the hybrid leptonic-hadronic model is closer to the observed one compared to the proton synchrotron model. We suggest that the hybrid leptonic-hadronic model is more favored if the neutrino event IceCube-170922A is associated with the blazar TXS 0506+056.