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Evidence for Neutrino Emission from X-Ray-bright Active Galactic Nuclei with IceCube

IceCube Collaboration; Abbasi, R.; Ackermann, M.; Adams, J.; Agarwalla, S. K.; Aguilar, J. A.; Ahlers, M.; Alameddine, J. M.; Ali, S.; Amin, N. M. ORCID iD icon 1; Andeen, K.; Argüelles, C.; Ashida, Y.; Athanasiadou, S.; Axani, S. N.; Babu, R.; Bai, X.; Balagopal V, A.; Baines-Holmes, J.; ... mehr

Abstract:

Recently, IceCube reported neutrino emission from the Seyfert galaxy NGC 1068. Using 13.1 yr 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 ± 0.2. Consistent with previous results, the observed neutrino flux exceeds its gamma-ray
counterpart by at least 2 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 3.3σ 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.


Verlagsausgabe §
DOI: 10.5445/IR/1000191863
Veröffentlicht am 02.04.2026
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 20.03.2026
Sprache Englisch
Identifikator ISSN: 2041-8205, 2041-8213
KITopen-ID: 1000191863
Erschienen in The Astrophysical Journal Letters
Verlag Institute of Physics Publishing Ltd (IOP Publishing Ltd)
Band 1000
Heft 1
Seiten Art.-Nr.: L26
Vorab online veröffentlicht am 18.03.2026
Nachgewiesen in Scopus
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