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We investigate the possibility that blazars in the Roma-BZCAT MultifrequencyCatalogue of Blazars (5BZCAT) are sources of the high-energy astrophysicalneutrinos detected by the IceCube Neutrino Observatory, as recently suggestedby Buson et al. (2022a,b). Although we can reproduce their $\sim 4.6\, \sigma$result, which applies to 7 years of neutrino data in the Southern sky, we findno significant correlation with 5BZCAT sources when extending the search to theNorthern sky, where IceCube is most sensitive to astrophysical signals. Tofurther test this scenario, we use a larger sample consisting of 10 years ofneutrino data recently released by the IceCube collaboration, this time findingno significant correlation in either the Southern or the Northern sky. Theseresults suggest that the strong correlation reported by Buson et al. (2022a,b)using 5BZCAT could be due to a statistical fluctuation and possibly the spatialand flux non-uniformities in the blazar sample. We perform some additionalcorrelation tests using the more uniform, flux-limited, and blazar-dominatedRadio Fundamental Catalogue (RFC) and find a $\sim 3.2\sigma$ equivalentp-value when correlating it with the 7-year Southern neutrino sky. However,this correlation disappears completely when extending the analysis to theNorthern sky and when analyzing 10 years of all-sky neutrino data. Our findingssupport a scenario where the contribution of the whole blazar class to theIceCube signal is relevant but not dominant, in agreement with most previousstudies.

Correlating high-energy IceCube neutrinos with 5BZCAT blazars and RFC sources