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Interpreting measurements of the anisotropic galaxy power spectrum

Research output: Contribution to journalArticle

  • Florian Beutler
  • Emanuele Castorina
  • Pierre Zhang
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 (ℓ = 1) and octopole (ℓ = 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. We show that our framework can successfully model the wide-angle effects in the BOSS DR12 dataset. We present estimators for the odd power spectrum multipoles and, detect these multipoles in BOSS DR12 with high significance. Understanding the impact of the wide-angle effects on the power spectrum multipoles is essential for many cosmological observables like primordial non-Gaussianity and the detection of General Relativistic effects and represents a potential systematic for measurements of Baryon Acoustic Oscillations and redshift-space distortions.
Original languageEnglish
Article number040
Number of pages33
JournalJournal of Cosmology and Astroparticle Physics
Issue number03
Publication statusPublished - 26 Mar 2019


  • 1810.05051

    Rights statement: This Accepted Manuscript is available for reuse under a CC BY-NC-ND 3.0 licence after the 12 month embargo period provided that all the terms of the licence are adhered to.

    Accepted author manuscript (Post-print), 1.02 MB, PDF document

    Licence: CC BY-NC-ND

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