Neutrino Emission from X-ray Bright Active Galactic Nuclei: a review of recent IceCube results

Abstract: The detection of a flux of TeV neutrinos from the nearby Seyfert galaxy NGC1068 is particularly intriguing. The neutrino flux measured by the IceCube neutrino observatory is at least two orders of magnitude higher than its gamma-ray counterpart, in contrast with the hypothesis of correlation between high-energy neutrinos and gamma-rays in AGN. This finding motivated further searches for neutrino emission in sources similar to NGC 1068. This source is among the brightest X-ray Seyfert galaxies, supporting models that suggest that high-energy neutrinos are produced in the vicinity of the supermassive black hole, most likely in the AGN corona. I will present the most recent IceCube results on searches for neutrino sources, including both a follow-up of already published results and findings on a newly compiled list of X-ray bright non-blazars AGN. In particular, we confirm the measurement of a neutrino flux from NGC1068, and we report the evidence of neutrino emission from a subset of 11 X-ray bright AGN at a 3.3σ level.