Speaker
Description
The detection of 1.5-15 TeV neutrino signals from the nearby Seyfert galaxy NGC 1068 by the IceCube Collaboration provides evidence of nonthermal processes at the heart of a supermassive black hole. In this talk, I discuss the possible production mechanisms, taking into account the constraints from neutrino and electromagnetic observations (Fermi-LAT, MAGIC, NuSTAR, etc.). We utilize the Astrophysical Multimessenger Emission Simulator to simulate the electromagnetic cascade processes taking place in the source. I show that only the hadronic scenario is viable, and rule out leptonic and beta decay scenarios. I also present constraints on the emission radius and the cosmic ray luminosity required to explain the observed neutrino luminosity, and discuss the viability of different models for cosmic ray acceleration.
