DOI

https://doi.org/10.48717/sgxz-p988

Project

EN011

Title

e-EVN: EA065D, EN011A, EC082B

Abstract

Blazars, with their extreme acceleration regimes, are ideal candidates for the emission of neutrinos of TeV/PeV energy. With a growing number of astrophysical neutrinos detected by IceCube, a boom of recent results from radio and gamma rays, both on single sources and samples, are providing observational support to this scenario. VLBI observations are the only tool to directly image the jet regions possibly involved in the neutrino production, as well as an efficient way to determine the physical parameters of the jet independently of other multi-wavelength observations. Moreover, VLBI observations are also an efficient tool to probe the nature of other radio sources localised within the generally large neutrino error region. In the present project, we request up to two triggers for 5 GHz multi-epoch e-VLBI observations of radio sources within the arrival direction of IceCube astrophysical neutrinos, provided that they have at least one good blazar counterpart (as demonstrated by presence of gamma-ray emission or of a bright archival VLBI flux density). Our team includes members of the VLBI community and the IceCube, Fermi, and CTA collaborations in a synergetic approach that exploits at best the real-time capabilities of the EVN.