acceleration [cosmic radiation] astro-ph.GA astro-ph.HE Astronomi, astrofysik och kosmologi Astronomy & Astrophysics Astronomy, Astrophysics and Cosmology Astrophysics - Astrophysics of Galaxies Astrophysics - High Energy Astrophysical Phenomena Astrophysics of Galaxies (astro-ph.GA) charged current cosmic radiation: acceleration energy spectrum flux [neutrino] FOS: Physical sciences galaxy gamma ray HAWC hep-ex High Energy Astrophysical Phenomena (astro-ph.HE) High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) IceCube info:eu-repo/classification/ddc/520 interaction [neutrino] LHAASO muon Neutrino astronomy neutrino: flux neutrino: interaction neutrino: particle source particle source [neutrino] QB460-466 Science & Technology site Subatomic Physics Subatomär fysik TeV Astrophysics Physical Sciences Physics
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 post-trials, is a 1.7 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.