http://arxiv.org/abs/2209.00305
We estimate the biases caused by the coherent deflection due to the galactic magnetic field (GMF) in the previous maximum-likelihood analysis for searching the UHECR sources. We simulate the mock event datasets with a set of assumptions for the starburst galaxy (SBG) source model, coherent deflection by a GMF model, and the mixed-mass composition, then conducted a maximum-likelihood analysis with ignorance of the GMF in the same manner as previous studies. We find that the anisotropic fraction $f_{\rm ani}$ is estimated systematically lower than the true value. We estimate the true parameters which are compatible with the best-fit parameters with the observation. We find that except for a narrow region with a large anisotropic fraction and small separation angular scale wide parameter space is still compatible with the experimental results. We also develop the maximum-likelihood method with consideration of the GMF model and confirm that the estimated parameters would be improved.
R. Higuchi, T. Sako, T. Fujii, et. al.
Fri, 2 Sep 22
10/62
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