Effects of the Galactic Magnetic Field on the UHECR Correlation Studies with Starburst Galaxies

DOI DOI Web Site Web Site 被引用文献1件 参考文献29件 オープンアクセス

書誌事項

公開日
2023-06-01
資源種別
journal article
権利情報
  • http://creativecommons.org/licenses/by/4.0/
  • https://iopscience.iop.org/info/page/text-and-data-mining
DOI
  • 10.3847/1538-4357/acc739
  • 10.48550/arxiv.2209.00305
公開者
American Astronomical Society

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説明

<jats:title>Abstract</jats:title> <jats:p>We estimate the biases caused by the coherent deflection of cosmic rays due to the Galactic magnetic field (GMF) in maximum likelihood analyses for searches of ultrahigh-energy cosmic-ray sources in the literature. We simulate mock event data sets with a set of assumptions for the starburst galaxy source model, coherent deflection by a GMF model, and mixed-mass composition. We then conduct a maximum likelihood analysis without accounting for the GMF in the same manner as previous studies. We find that the anisotropic fraction <jats:italic>f</jats:italic> <jats:sub>ani</jats:sub> is estimated to be systematically lower than the true value. We estimate the true parameters that are compatible with the best-fit parameters that were reported, and find that except for a narrow region with a large anisotropic fraction and a small separation angular scale, a wide parameter space is still compatible with the experimental results. We also develop a maximum likelihood method that takes the GMF model into account and confirm in Monte Carlo simulations that we can estimate the true parameters within a 1<jats:italic>σ</jats:italic> contour under the ideal condition that we know the event-by-event mass and the GMF.</jats:p>

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