Probing for Neutrino Emission from Blazar TXS 0506+056

The origin of the astrophysical neutrino flux observed by IceCube remains an open question, with known blazars contributing up to 27%. The detection of a high-energy neutrino, IceCube-170922A, coincident with a gamma- ray flare from the blazar TXS 0506+056 in 2017, provided the first concrete evidence of a blazar as a source of cosmic rays that generate neutrinos and gamma rays. This work presents a new investigation into proton cascade emission from TXS 0506+056 by analyzing gamma-ray data from the Fermi Large Area Telescope (LAT) and VERITAS. We perform a joint spectral analysis of the observed gamma-ray flux and neutrino data, comparing them to predictions from proton-induced cascades in intergalactic space. Using Monte Carlo simulations, we explore the contribution of cosmic rays escaping the source to the gamma-ray and neutrino emissions and derive constraints on the proton escape luminosity.