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Evidence for Neutrino Emission from X-ray Bright Active Galactic Nuclei with IceCube
Preprint

Evidence for Neutrino Emission from X-ray Bright Active Galactic Nuclei with IceCube

R Abbasi, M Ackermann, J Adams, S. K Agarwalla, J. A Aguilar, M Ahlers, J. M Alameddine, S Ali, N. M Amin, K Andeen, …
ArXiv.org
15 Oct 2025
DOI: https://doi.org/10.48550/arxiv.2510.13403
url
https://arxiv.org/pdf/2510.13403View
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Abstract

Physics - High Energy Astrophysical Phenomena
Recently, IceCube reported neutrino emission from the Seyfert galaxy NGC 1068. Using 13.1 years of IceCube data, we present a follow-up search for neutrino sources in the northern sky. NGC 1068 remains the most significant neutrino source among 110 preselected gamma-ray emitters while also being spatially compatible with the most significant location in the northern sky. Its energy spectrum is characterized by an unbroken power-law with spectral index$γ= 3.4 \pm 0.2$ . Consistent with previous results, the observed neutrino flux exceeds its gamma-ray counterpart by at least two orders of magnitude. Motivated by this disparity and the high X-ray luminosity of the source, we selected 47 X-ray bright Seyfert galaxies from the Swift/BAT spectroscopic survey that were not included in the list of gamma-ray emitters. When testing this collection for neutrino emission, we observe a 3.3 $σ$excess from an ensemble of 11 sources, with NGC 1068 excluded from the sample. Our results strengthen the evidence that X-ray bright cores of active galactic nuclei are neutrino emitters.

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