Estimation and reduction of the biases by the galactic magnetic field on the UHECR correlation studies

The correlation studies between ultrahigh-energy cosmic ray (UHECR) anisotropy and source candidates are keys to understand the origin of UHECRs. Especially, with consideration models, magnetic fields, mass compositions necessary. We estimated biases caused by coherent deflection due galactic field (GMF) in previous maximum-likelihood analysis for searching UHECR sources (Aab et al. 2018, Abbasi 2018). In our work simulated mock datasets, we find that anisotropic fraction f ani is systematically lower than true value when ignore effect GMF. also develop method which includes GMF model confirm parameters would be improved. apply observational datasets obtained from Telescope Array Auger experiments.