Search for Extended Sources of Neutrino Emission in the Galactic Plane with IceCube

Abstract

The Galactic plane, harboring a diffuse neutrino flux, is a particularly interesting target to study potential cosmic-ray acceleration sites. Recent gamma-ray observations by HAWC and LHAASO have presented evidence for multiple Galactic sources that exhibit a spatially extended morphology and have energy spectra continuing beyond 100 TeV. A fraction of such emission could be produced by interactions of accelerated hadronic cosmic rays, resulting in an excess of high-energy neutrinos clustered near these regions. Using 10 years of IceCube data comprising track-like events that originate from charged-current muon neutrino interactions, we perform a dedicated search for extended neutrino sources in the Galaxy. We find no evidence for time-integrated neutrino emission from the potential extended sources studied in the Galactic plane. The most significant location, at 2.6$\sigma$ post-trials, is a 1.7${}^{\circ }$ sized region coincident with the unidentified TeV gamma-ray source 3HWC J1951+266. We provide strong constraints on hadronic emission from several regions in the Galaxy.

13 pages, 4 figures, 5 tables including an appendix. Accepted for publication in Astrophysical Journal

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Cited by in corpus (5)

• Impact of anisotropic cosmic-ray transport on the gamma-ray signatures in the Galactic Center
• Search for joint multimessenger signals from potential galactic cosmic-ray accelerators with HAWC and IceCube
• Time-integrated constraint on neutrino flux of CHIME fast radio burst sources with 10-year IceCube point-source data
• Search for neutrino signals correlated with LHAASO diffuse Galactic emission
• TeV-PeV Gamma-ray and Neutrino Emission in the Galactic Plane