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The anisotropic 2-point correlation function (2PCF) of galaxies measurespairwise clustering as a function of the pair separation's angle to the line ofsight. The latter is often defined as either the angle bisector of theobserver-galaxy-pair triangle or the vector from the observer to the separationmidpoint. Here we show how to accelerate either of these measurements withFourier Transforms, using a slight generalization of the Yamamoto et al. (2006)estimator in which each member of the pair is used successively as the line ofsight. We also present perturbation theory predictions for our generalizedestimator including wide-angle corrections.

A new look at lines of sight: using Fourier methods for the wide-angle anisotropic 2-point correlation function