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Abstract: We consider the dependence of ultra-high energy cosmic ray UHECR fluxpredictions on the choice of galaxy catalogue. We demonstrate that modelpredictions by Koers and Tinyakov 2009b, based on the so-called KKKSTcatalogue, are in good agreement with predictions based on the XSCz catalogue,a recently compiled catalogue that contains spectroscopic redshifts for a largefraction of galaxies. This agreement refutes the claim by Kashti 2009 thatthe KKKST catalogue is not suited for studies of UHECR anisotropy due to itsdependence on photometric redshift estimates. In order to quantify the effectof galaxy catalogues on flux predictions, we develop a measure of anisotropiesassociated with model flux maps. This measure offers a general criterion tostudy the effect of model parameters and assumptions on the predicted strengthof UHECR anisotropies.



Author: Hylke B. J. Koers, Peter Tinyakov

Source: https://arxiv.org/







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