UHECR deflections in the coherent Galactic magnetic field
Alexander Korochkin, Dmitri Semikoz, Peter Tinyakov
TL;DR
This paper compares how different models of the Galactic magnetic field predict the deflections of ultra-high-energy cosmic rays, highlighting uncertainties and key magnetic components affecting cosmic ray trajectories.
Contribution
It systematically analyzes and compares deflection predictions of multiple GMF models for ultra-high-energy cosmic rays at various rigidities.
Findings
Different GMF models yield varying deflection estimates.
Certain magnetic field components dominate deflections in specific sky regions.
Uncertainties in GMF modeling impact cosmic ray source localization.
Abstract
We study the deflections of ultra-high-energy cosmic rays in several widely used models of the coherent Galactic magnetic field (GMF), including PT11 (Pshirkov et al. [1]), JF12 (Jansson and Farrar [2]), UF23 (Unger and Farrar [3]) and KST24 (Korochkin, Semikoz, and Tinyakov [4]). We propagate particles with rigidities of 5, 10, and 20 EV and analyze the differences in deflection predictions across these GMF models. We identify the GMF components responsible for deflections in various regions of the sky and discuss the uncertainties in modeling these components, as well as potential future improvements.
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