Search for Neutrino Emission from Hard X-Ray AGN with IceCube

R. Abbasi; M. Ackermann; J. Adams; S. K. Agarwalla; J. A. Aguilar; M. Ahlers; J M Alameddine; N. M. Amin; IceCube Collaboration; Matheus Hostert

doi:10.3847/1538-4357/ada94b

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Search for Neutrino Emission from Hard X-Ray AGN with IceCube

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Search for Neutrino Emission from Hard X-Ray AGN with IceCube

R. Abbasi, M. Ackermann, J. Adams, S. K. Agarwalla, J. A. Aguilar, M. Ahlers, J M Alameddine, N. M. Amin, IceCube Collaboration and Matheus Hostert

The Astrophysical journal, Vol.981(2), 131

03/10/2025

DOI: 10.3847/1538-4357/ada94b

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Abstract

Active galactic nuclei (AGN) are promising candidate sources of high-energy astrophysical neutrinos, since they provide environments rich in matter and photon targets where cosmic-ray interactions may lead to the production of gamma rays and neutrinos. We searched for high-energy neutrino emission from AGN using the Swift-BAT Spectroscopic Survey catalog of hard X-ray sources and 12 yr of IceCube muon track data. First, upon performing a stacked search, no significant emission was found. Second, we searched for neutrinos from a list of 43 candidate sources and found an excess from the direction of two sources, the Seyfert galaxies NGC 1068 and NGC 4151. We observed NGC 1068 at flux Φνμ+‾νμ = 4.02 +1.58 -1.52 x 10 -11 TeV −1 cm −2 s −1 normalized at 1 TeV, with a power-law spectral index γ = 3.10 +0.26 -0.22 , consistent with previous IceCube results. The observation of a neutrino excess from the direction of NGC 4151 is at a posttrial significance of 2.9 σ . If interpreted as an astrophysical signal, the excess observed from NGC 4151 corresponds to a flux Φνμ+‾νμ = 1.51 +0.99 -0.81 x 10 -11 TeV −1 cm −2 s −1 normalized at 1 TeV and γ = 2.83 +0.35 -0.28 .

Details

Title: Subtitle: Search for Neutrino Emission from Hard X-Ray AGN with IceCube
Creators: R. Abbasi - Loyola University Chicago
M. Ackermann - Deutsches Elektronen-Synchrotron DESY
J. Adams - University of Canterbury
S. K. Agarwalla - University of Wisconsin–Madison
J. A. Aguilar - Université Libre de Bruxelles
M. Ahlers - University of Copenhagen
J M Alameddine - TU Dortmund University
N. M. Amin - University of Delaware
IceCube Collaboration
Matheus Hostert (Contributor) - Physics and Astronomy
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.981(2), 131
DOI: 10.3847/1538-4357/ada94b
ISSN: 0004-637X
eISSN: 1538-4357
Language: English
Date published: 03/10/2025
Academic Unit: Physics and Astronomy
Record Identifier: 9984946624702771

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