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2018

Interpreting measurements of the anisotropic galaxy power spectrum

Beutler, Florian, Castorina, Emanuele, Zhang, Pierre

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The most commonly used estimators of the anisotropic galaxy power spectrum employ Fast Fourier transforms, and rely on a specific choice of the line-of-sight that breaks the symmetry between the galaxy pair.

This leads to wide-angle effects, including the presence of odd power spectrum multipoles like the dipole ($\ell = 1$) and octopole ($\ell = 3$).
In Fourier-space these wide-angle effects also couple to the survey window function.
We present a self-consistent framework extending the commonly used window function treatment to include the wide-angle effects.

Interpreting measurements of the anisotropic galaxy power spectrum · Around

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