Karlsruhe 2024 – scientific programme
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T: Fachverband Teilchenphysik
T 10: Gamma astronomy 1
T 10.4: Talk
Monday, March 4, 2024, 16:45–17:00, Geb. 30.22: kl. HS A
Investigation of the influence of an updated model for the extragalactic background light on the multi-messenger signatures of Blazar 3C279 with CRPropa — •Yannick Schmidt1,2, Lukas Merten1,2, 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
In order to come closer to understanding extragalactic sources of cosmic rays and their intrinsic mechanisms, the analysis of various multi-messenger signals has proven to be extremely promising in recent decades. Typically, numerical simulations are undertaken to investigate the validity of various astrophysical scenarios. Predictions considering photonuclear interactions depend significantly on the modeling of extragalactic photon fields. Therefore, in the present work an updated model of the extragalactic background light was implemented in the open-source code CRPropa 3.2 to investigate its effects on gamma-ray signals from blazar 3C279. In particular, the new model showed a higher prediction of produced photons by inverse Compton scattering when simulating electromagnetic cascades, while the opacity of the universe for gamma radiation was lower than in previous models.
Keywords: cosmic rays; gamma opacity; extragalactic photon fields; CRPropa; photonuclear interactions