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

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

IceCube

Collaboration

Jun 10, 2024

17 pages

Published in:

Astrophys.J. 981 (2025) 2, 131

Published: Mar 4, 2025

e-Print:

2406.06684 [astro-ph.HE]

DOI:

10.3847/1538-4357/ada94b

Experiments:

View in:

ADS Abstract Service

reference search17 citations

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Abstract: (IOP)

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+ν¯μ= 4.02−1.52+1.58×10−11TeV

^{−1}

cm

^{−2}

s

^{−1}

normalized at 1 TeV, with a power-law spectral index γ = 3.10−0.22+0.26, consistent with previous IceCube results. The observation of a neutrino excess from the direction of NGC 4151 is at a posttrial significance of 2.9σ. If interpreted as an astrophysical signal, the excess observed from NGC 4151 corresponds to a flux ϕνμ+ν¯μ= 1.51−0.81+0.99×10−11TeV

^{−1}

cm

^{−2}

s

^{−1}

normalized at 1 TeV and γ = 2.83−0.28+0.35.

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R. Abbasi
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(
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)
,
M. Ackermann
(
- DESY, Zeuthen
)
,
J. Adams
(
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)
,
J.A. Aguilar
(
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)
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(
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)

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•
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R. Abbasi
(
- Loyola U., Chicago
)
,
M. Ackermann
(
- DESY, Zeuthen
)
,
J. Adams
(
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- Canterbury U.
)
,
J.A. Aguilar
(
- Brussels U.
)
,
M. Ahlers
(
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)

et al.

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•
e-Print:
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•
DOI:
- 10.3847/1538-4357/ac8de4

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IceCube

Collaboration

•

R. Abbasi
(
- Loyola U., Chicago
)

et al.

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•
e-Print:
- 2111.10169
•
DOI:
- 10.1103/PhysRevD.106.022005

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