Göttingen 2025 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 80: Cosmic Rays IV

T 80.2: Vortrag

Donnerstag, 3. April 2025, 16:30–16:45, VG 3.102

Anisotropy induced by a modulation of the ultra-high-energy cosmic ray flux — •Janning Meinert^1,2, Leonel Morejón¹, Veronika Vašíčková¹, and Karl-Heinz Kampert¹ — ¹Bergische Universität Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany — ²ITP Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany

We investigate the energy-dependent residence time of extragalactic cosmic rays due to the galactic magnetic field using CRPropa. We examine whether a sudden and substantially increased flux of homogeneously injected ultra-high-energy cosmic rays (UHECR) in the past about 10-100 kiloyears leads to a dipole, as observed by the latest Auger data for proton injection only. Another observable will be the energy dependent amplitude evolution. An agreement with anisotropy data while preserving a homogeneous injection of cosmic rays could strengthen the hypothesis of one predominant UHECR source, such as Centaurus A, which may be isotropised due to echoes in the council of giants. While currently mild tensions between the dipole amplitude between Auger data and the simulation are apparent for the highest energies (E ≥ 32 EeV), incorporating more realistic simulation scenarios might mitigate those tensions in the future.

*Supported by DFG under SFB 1491

Keywords: cosmic rays; galactic magnetic fields; anisotropies