Association of IceCube neutrinos with radio sources observed at Owens Valley and Metsähovi Radio Observatories

Identifying the most likely sources for high-energy neutrino emission has been one of main topics in astrophysics ever since first observation neutrinos by IceCube Neutrino Observatory. Active galactic nuclei with relativistic jets, also known as blazars, have considered to be candidates because their ability accelerate particles high energies. We study connection between radio and events using data from Owens Valley Radio Observatory (OVRO) Mets\"ahovi blazar monitoring programs. identify our sample that are positionally consistent events. estimate mean flux density variability amplitudes around arrival time, compare these values random samples establish significance results. find source associations within 15 detected IceCube. Nearly half associated not $\gamma$-ray energies, but properties Doppler boosting factors similar objects sample, meaning they could still potential emitters. number strongly flaring statistically complete OVRO is unlikely a coincidence (at $2\sigma$ level). Based on results, we conclude although it clear all strong observations large-amplitude flares at same time event coincidence.