The active galaxy NGC 1068 was recently identified by the IceCube neutrino observatory as the first known steady-state, extragalactic neutrino point source, associated with about 79 events over ten years. We use the IceCube data to place limits on possible neutrino self-interactions mediated by scalar particles with mass between 1 - 10 MeV. We find that constraints on flavor-specific ντ self-interactions with low mediator masses are comparable to constraints derived from the diffuse high-energy neutrino flux at low energies, while constraints on flavor-universal self-interactions are less restrictive than current bounds.
@article{arxiv.2307.02361,
title = {Constraints on Neutrino Self-Interactions from IceCube Observation of NGC 1068},
author = {Jeffrey M. Hyde},
journal= {arXiv preprint arXiv:2307.02361},
year = {2023}
}