Association of IceCube neutrinos with radio sources observed at Owens Valley and Mets\"ahovi Radio Observatories
T. Hovatta, E. Lindfors, S. Kiehlmann, W. Max-Moerbeck, M. Hodges, I., Liodakis, A. Lahteenmaki, T. J. Pearson, A. C. S. Readhead, R. A. Reeves, S., Suutarinen, J. Tammi, M. Tornikoski

TL;DR
This study investigates the connection between radio-emitting blazars and high-energy neutrino events detected by IceCube, finding significant associations and suggesting some blazars as potential neutrino sources.
Contribution
It provides the first statistical evidence linking radio flaring blazars to IceCube neutrino events, highlighting the importance of radio variability in neutrino source identification.
Findings
15 neutrino events have associated radio sources.
Nearly half of these sources are not gamma-ray detected.
Radio flaring blazars are unlikely to be random coincidences.
Abstract
Identifying the most likely sources for high-energy neutrino emission has been one of the main topics in high-energy astrophysics ever since the first observation of high-energy neutrinos by the IceCube Neutrino Observatory. Active galactic nuclei with relativistic jets, also known as blazars, have been considered to be one of the main candidates because of their ability to accelerate particles to high energies. We study the connection between radio emission and IceCube neutrino events using data from the Owens Valley Radio Observatory (OVRO) and Mets\"ahovi Radio Observatory blazar monitoring programs. We identify sources in our radio monitoring sample that are positionally consistent with IceCube high-energy neutrino events. We estimate their mean flux density and variability amplitudes around the neutrino arrival time, and compare these with values from random samples to establish…
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