Ponente
Descripción
The coincident detection of high-energy $\gamma$-rays and neutrinos from TXS 0506+056 marks the first multimessenger detection involving neutrinos. The observation suggests the presence of hadronic acceleration in this source. Neutrino sources may also be $\gamma$-ray opaque, in which case the photons cascade down to lower energies before leaving the source. Determining the $\gamma$-ray transparency of a source is important to understand the astrophysical environment. However, this determination may be hindered by high-energy $\gamma$-ray propagation through the extragalactic background light (EBL) and the cosmic microwave background (CMB), due to the electromagnetic cascades which delay the electromagnetic signal and shift the flux to lower energies. In this work we study the detectability of $\gamma$-ray counterparts to high-energy neutrino sources by simulating the photon propagation with Monte Carlo simulations. This allows us to map the multimessenger horizon - the maximum distance where both neutrinos and $\gamma$-rays from a source can be jointly observed.
