Evidence of Neutrino Emission from X-ray Bright Seyfert Galaxies with IceCube

The IceCube Neutrino Observatory has detected evidence for TeV neutrinos from NGC 1068, a nearby Seyfert galaxy. This discovery suggests that active galactic nuclei may play a significant role as sources of high-energy astrophysical neutrinos. Interestingly, the absence of the expected TeV gamma-ray flux indicates that these gamma-rays could be effectively obscured at their production site, with the hot coronal environment near the Seyfert galaxy’s core being a plausible location for this attenuation. Theoretical models suggest that the properties of the corona—and thus the production of neutrinos—can be inferred from the galaxy’s intrinsic X-ray luminosity. In this presentation, we report our search for neutrino emission from a sample of X-ray bright Seyfert galaxies selected from the BASS survey. We have employed a disc-corona model to predict the neutrino flux, improving the sensitivity of our search, and compared this model to the more traditional power-law flux assumption. Our stacking analysis shows a 3σ
neutrino emission signal from the catalog's collective sources.