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• W2766705874 abstract "This work presents a scenario of ultra-high energy cosmic ray source distribution where a nearby source is solely responsible for the anisotropies in arrival directions of cosmic rays while the rest of the sources contribute only isotropically. An analytical approach focused on large-scale anisotropies, which are influenced by deflections in a Kolmogorov-type turbulent magnetic field, is employed to provide more general results. When the recent Pierre Auger Observatory angular power spectrum above 8 EeV is used the restricted model gives, under the assumption of the small angle approximation, a solution where the RMS deflection with respect to the line of sight is $alpha_{rm rms} = left(50^{+11}_{-10}right)^circ$, while the relative flux from the single source $eta=0.03pm 0.01$. Furthermore, the solution can be translated into constraints on the source distance, luminosity, and extra-galactic magnetic field strength. For Centaurus A and the Virgo cluster the required relation between the coherence length and the RMS magnetic field strength is obtained: a coherence length of $~sim 100,mathrm{kpc}$ would imply the RMS field strength around $1,mathrm{nG}$ for iron dominated and above $10,mathrm{nG}$ for proton dominated composition. We also performed trajectory simulations with our publicly available code CRPropa to show that our analytical model can serve as a good approximation as long as the deflections in cosmic magnetic fields can be described as a random walk. The simulations showed that generally structured fields tend to suppress large-scale anisotropies, especially the dipole, compared to anisotropies at smaller scales described by higher multipoles." @default.
• W2766705874 created "2017-11-10" @default.
• W2766705874 creator A5011276262 @default.
• W2766705874 creator A5021090128 @default.
• W2766705874 date "2019-01-07" @default.
• W2766705874 modified "2023-09-26" @default.
• W2766705874 title "Anisotropies of ultra-high energy cosmic rays dominated by a single source in the presence of deflections" @default.
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• W2766705874 doi "https://doi.org/10.1088/1475-7516/2019/01/018" @default.
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