Time-integrated Southern-sky Neutrino Source Searches with 10 yr of IceCube Starting-track Events at Energies Down to 1TeV

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

doi:10.3847/1538-4357/ae2c86

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Time-integrated Southern-sky Neutrino Source Searches with 10 yr of IceCube Starting-track Events at Energies Down to 1TeV

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Time-integrated Southern-sky Neutrino Source Searches with 10 yr of IceCube Starting-track Events at Energies Down to 1TeV

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

The Astrophysical journal, Vol.998(1), 37

02/10/2026

DOI: 10.3847/1538-4357/ae2c86

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Abstract

In the IceCube Neutrino Observatory, a signal of astrophysical neutrinos is obscured by backgrounds from atmospheric neutrinos and muons produced in cosmic-ray interactions. IceCube event selections used to isolate the astrophysical neutrino signal often focus on the morphology of the light patterns recorded by the detector. The analyses presented here use the new IceCube Enhanced Starting Track Event Selection (ESTES), which identifies events likely generated by muon-neutrino interactions within the detector geometry, focusing on neutrino energies of 1-500 TeV with a median angular resolution of 1.4 degrees. Selecting for starting-track events filters out not only the atmospheric-muon background but also the atmospheric-neutrino background in the southern sky. This improves IceCube's muon-neutrino sensitivity to southern-sky neutrino sources, especially for Galactic sources that are not expected to produce a substantial flux of neutrinos above 100 TeV. In this work, the ESTES sample was applied for the first time to search for astrophysical sources of neutrinos, including a search for diffuse neutrino emission from the Galactic plane. No significant excesses were identified from any of the analyses; however, constraining limits are set on the hadronic emission from TeV gamma-ray Galactic plane objects and models of the diffuse Galactic plane neutrino flux.

Physical Sciences

Astronomy & Astrophysics

Science & Technology

Details

Title: Subtitle: Time-integrated Southern-sky Neutrino Source Searches with 10 yr of IceCube Starting-track Events at Energies Down to 1TeV
Creators: IceCube Collaboration
R Abbasi (Contributor) - Loyola University Chicago
M Ackermann (Contributor) - Deutsches Elektronen-Synchrotron DESY
J. Adams (Contributor) - University of Canterbury
S K Agarwalla (Contributor) - Institute of Physics, Bhubaneshwar
J. A Aguilar (Contributor) - Université Libre de Bruxelles
M. Ahlers (Contributor) - University of Copenhagen
J M Alameddine (Contributor) - TU Dortmund University
N. M. Amin (Contributor) - University of Delaware
M. Hostert (Contributor) - Harvard University
Resource Type: Journal article
Publication Details: The Astrophysical journal, Vol.998(1), 37
DOI: 10.3847/1538-4357/ae2c86
ISSN: 0004-637X
eISSN: 1538-4357
Publisher: IOP Publishing Ltd
Number of pages: 19
Grant note: European Union-EGI Advanced Computing for research NVIDIA Corporation; Nvidia Corporation Germany-Bundesministerium fur Bildung und Forschung (BMBF); Federal Ministry of Education & Research (BMBF) Australia-Australian Research Council New Zealand-Marsden Fund; Royal Society of New Zealand; Marsden Fund (NZ) Swedish Polar Research Secretariat Advanced Cyberinfrastructure Coordination Ecosystem: Services & Support (ACCESS) FWO Odysseus and Big Science programmes WestGrid Deutsche Forschungsgemeinschaft (DFG); German Research Foundation (DFG)
Language: English
Date published: 02/10/2026
Academic Unit: Physics and Astronomy
Record Identifier: 9985143156902771

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