SMuK 2023 – scientific programme

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T: Fachverband Teilchenphysik

T 144: Cosmic Ray VII

T 144.2: Talk

Thursday, March 23, 2023, 17:45–18:00, POT/0013

An all-sky search method for coherent magnetic field deflections of ultra-high-energy cosmic rays — •Josina Schulte¹, Teresa Bister², and Martin Erdmann¹ — ¹III. Physikalisches Institut A, RWTH Aachen University — ²Institute for Mathematics, Astrophysics and Particle Physics, Radboud Universiteit Nijmegen

We present a method of searching for coherent deflection patterns in ultra-high-energy cosmic ray arrival directions induced by the Galactic magnetic field. These patterns are described by a variable magnetic field strength in combination with adaptable coefficients of a spherical harmonics expansion in our approach. The reconstruction of the free model parameters from the arrival directions is performed with a likelihood-free method in a Bayesian approach based on normalizing flows. This allows for a straightforward assessment of the uncertainty on the model prediction. We evaluate the sensitivity of the method to identify the presence of coherent magnetic field deflections on a realistic simulated astrophysical scenario.