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Fig. 31.

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Dipole amplitude and cosmic variance. Top: energy evolution of the dipole amplitude predicted for scenarios based on model A, a 1 nG EGMF and the JF12+Planck GMF with λc = 200 pc assuming source densities of 10−3, 10−4 and 10−5 Mpc−3, in the mother catalog approach. The mean values and the dispersion of the predictions (90% interval), estimated over 300 realizations are shown respectively with markers and shaded areas and compared to the values reconstructed with Auger data. Center: scatter plot of the fractional contribution of the strongest source above 10 EeV to the total flux as a function the dipole amplitude above 8 EeV for the different realizations considered in the top panel. The 1σ interval estimated with Auger data on the dipole amplitude is shown with a shaded area. Bottom: same as top panel now assuming source model A′, a 1 nG EGMF and the JF12+Planck GMF with λc = 50 pc and 300 realizations of an homogeneous and isotropic distribution of sources with a 10−4 Mpc−3 density.

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