Time-Integrated Searches for Sub-TeV Neutrino Sources with IceCube-DeepCore

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

doi:10.48550/arxiv.2609.12055

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Time-Integrated Searches for Sub-TeV Neutrino Sources with IceCube-DeepCore

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Time-Integrated Searches for Sub-TeV Neutrino Sources with IceCube-DeepCore

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

arXiv

09/10/2026

DOI: 10.48550/arxiv.2609.12055

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https://doi.org/10.48550/arxiv.2609.12055View

Preprint (Author's original) This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

We have developed techniques for a competitive sub-TeV time-integrated neutrino search and applied it to 11.1 years of IceCube-DeepCore data. The DeepCore subarray lowers the sensitivity of IceCube down to sub-TeV energies and is especially interesting for objects with soft spectra. Three studies were performed: a search for neutrino emission from AGN exhibiting high intrinsic X-ray flux, including NGC 1068, as identified by SWIFT/BAT; a search for neutrino emission from Galactic objects identified by Fermi-LAT as exhibiting a spectral shape consistent with neutral pion decay; and an all-sky search for neutrino point sources. Objects for this study were selected given their prospects for sub-TeV neutrino emission. No evidence for sub-TeV neutrino emission is found in any of the searches performed. Finally, for each catalog of objects, we use a statistical combination of the p-values via a binomial test to search for aggregated neutrino emission from a subset of the objects. Neither of the binomial tests yields significant results. For NGC 1068, assuming a power law spectrum with index 3.4, the 90% confidence level upper limit on per-flavor neutrino emission in the 30--400 GeV range is$Φ_{ν+\barν}|_{\mathrm{1 TeV}} < 9.5 \times 10^{-11}$TeV $^{-1}$cm $^{-2}$s $^{-1}$ , a factor of two higher than the extrapolation of IceCube's measurement at higher energies. We additionally provide neutrino flux upper limits for a variety of spectra.

Physics - High Energy Astrophysical Phenomena

Details

Title: Subtitle: Time-Integrated Searches for Sub-TeV Neutrino Sources with IceCube-DeepCore
Creators: IceCube Collaboration
R Abbasi (Contributor)
M Ackermann (Contributor) - Stanford University
J. Adams (Contributor) - University of Canterbury
J. A Aguilar (Contributor) - Université Libre de Bruxelles
M Ahlers (Contributor) - University of Copenhagen
J M Alameddine (Contributor) - TU Dortmund University
S Ali (Contributor) - University of Kansas
N. M Amin (Contributor) - University of Delaware
M Hostert (Contributor)
Resource Type: Preprint
Publication Details: arXiv
DOI: 10.48550/arxiv.2609.12055
ISSN: 2331-8422
Publisher: arXiv
Language: English
Date posted: 09/10/2026
Academic Unit: Physics and Astronomy
Record Identifier: 9985225923202771

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