Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 32: Neutrino Astronomy II
T 32.5: Vortrag
Dienstag, 1. April 2025, 17:15–17:30, VG 1.105
The Galactic Diffuse Neutrino Emission in a combined fit of Muon Tracks and Cascades with IceCube* — •Jonas Hellrung1,2, Niclas Krieger1,2, and Julia Tjus1,2,3 for the IceCube collaboration — 1Theoretical Physics IV, Plasma Astroparticle Physics, Faculty for Physics and Astronomy, Ruhr University Bochum, 44780 Bochum, Germany — 2Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Germany — 3Department of Space, Earth and Environment, Chalmers University of Technology, 412 96 Gothenburg, Sweden
Although cosmic rays (CRs) were discovered more than a hundred years ago, their origin is not yet understood. One problem is that the cosmic-ray spectrum can only be measured close to Earth. However, there is a way to indirectly study the distribution of CRs in the Galaxy: When CRs interact with the interstellar medium, they produce gamma rays and neutrinos. The first observation of this neutrino flux was published in 2023 by IceCube. Here I present plans for a new analysis combining different event topologies. IceCube measures events in two main topologies: Tracks, originating in charged current νµ interactions, provide a better angular resolution. In contrast cascades, from most other possible interactions, provide a better energy resolution and are able to observe the Southern sky (and therefore the Galactic Center) despite the huge background of atmospheric muons. Combining both event topologies in one analysis exploits all these advantages. Sensitivities and model discrimination power of such a measurement are discussed here. *Supported by BMBF and SFB 1491
Keywords: Diffuse Neutrinos; IceCube; Galactic Plane; Combined Fit