Göttingen 2025 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 57: Gamma Astronomy I
T 57.8: Vortrag
Mittwoch, 2. April 2025, 18:00–18:15, VG 3.101
Impact of the three-dimensional Galactic gas distribution on the modeling of the diffuse gamma-ray flux* — •Yannick Schmidt1,2, Julien Dörner1,2, Jonas Hellrung1,2, and Julia Becker Tjus1,2,3 — 1Theoretical Physics IV, Plasma Astroparticle Physics, Faculty of 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
The high-energy γ-ray sky is predominantly shaped by diffuse emissions arising from non-thermal processes, such as inverse Compton scattering, Bremsstrahlung, and the decay of neutral pions. Simulations of these emissions serve as valuable tools to constrain models of the Galactic cosmic-ray population, providing insights into their origin and propagation through the interstellar medium (ISM). The accuracy of these simulations is highly dependent on the spatial distribution of the interstellar gas. To date, many models rely on a 2D cylindrically symmetric geometry, which imposes significant limitations in terms of physical realism. In this work, we investigate the impact of explicit three-dimensional distributions for the neutral gas components of the ISM on π0-production. This is achieved by integrating the local emissivity along the line of sight, as implemented in the HERMES software framework. The resulting γ-ray emissions are subsequently analysed and compared with those obtained using traditional two-dimensional ring models for the gas distribution. * supported by SFB1491
Keywords: Diffuse Gamma Rays; Galactic Gas Distribution; Galactic Cosmic Rays; Pi-Zero Decay