论文标题
银河磁场对Starburst星系UHECR相关研究的影响
Effects of galactic magnetic field on the UHECR correlation studies with starburst galaxies
论文作者
论文摘要
我们估计了由于文献中超高能宇宙射线（UHECR）搜索的搜索，估计了由于银河磁场（GMF）引起的宇宙射线（GMF）引起的相干偏转而引起的偏差。我们使用一组假设的模拟事件数据集模拟了Starburst Galaxy（SBG）源模型（ARXIV：1801.06160），通过GMF模型（ARXIV：1204.3662，ARXIV：ARXIV：1210.7820）和混合质量组成（Arxiv：190333333338）;然后，我们进行了最大样品分析，而没有与以前的研究相同的方式考虑GMF。我们发现各向异性分数$ f _ {\ rm ani} $系统地估计低于真实值。我们估计与（ARXIV：1801.06160）报告的最佳拟合参数兼容的真实参数，并发现除了具有较大各向异性分数和较小的分离角度尺度的狭窄区域外，宽的参数空间仍然与实验结果相符。我们还开发了一种最大似然方法，该方法考虑了GMF模型，并在MC模拟中确认我们可以在理想条件下估算1 $σ$轮廓内的真实参数，我们知道事件是逐个事件的质量和GMF。
We estimate the biases caused by the coherent deflection of cosmic rays due to the Galactic magnetic field (GMF) in maximum-likelihood analysis for searches of ultrahigh-energy cosmic ray (UHECR) sources in the literature. We simulate mock event datasets with a set of assumptions for the starburst galaxy (SBG) source model (arXiv:1801.06160), coherent deflection by a GMF model (arXiv:1204.3662,arXiv:1210.7820), and mixed-mass composition (arXiv:1901.03338); 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 $f_{\rm ani}$ is estimated systematically lower than the true value. We estimate the true parameters which are compatible with the best-fit parameters reported in (arXiv:1801.06160), and find that except for a narrow region with a large anisotropic fraction and small separation angular scale a wide parameter space is still compatible with the experimental results. We also develop a maximum-likelihood method that takes into account the GMF model and confirm in the MC simulations that we can estimate the true parameters within a 1$σ$ contour under the ideal condition that we know the event-by-event mass and the GMF.
