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Using angular pair upweighting to improve 3D clustering measurements

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  • Will J. Percival
  • Davide Bianchi
Three dimensional galaxy clustering measurements provide a wealth of cosmological information. However, obtaining spectra of galaxies is expensive, and surveys often only measure redshifts for a subsample of a target galaxy population. Provided that the spectroscopic data is representative, we argue that angular pair upweighting should be used in these situations to improve the 3D clustering measurements. We present a toy model showing mathematically how such a weighting can improve measurements, and provide a practical example of its application using mocks created for the Baryon Oscillation Spectroscopic Survey (BOSS). Our analysis of mocks suggests that, if an angular clustering measurement is available over twice the area covered spectroscopically, weighting gives a ∼ 10-20% reduction of the variance of the monopole correlation function on the BAO scale.
Original languageEnglish
Pages (from-to)L40-L44
Number of pages5
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
Early online date26 Aug 2017
Publication statusPublished - 21 Nov 2017


  • 1703.02071v3

    Rights statement: This is a pre-copyedited, author-produced PDF of an article accepted for publication in MNRAS following peer review. The final published version of record by Will J. Percival et al. 'Using angular pair upweighting to improve 3D clustering measurements ' MNRAS (21 November, 2017) Vol. 472, L40-L44 is available online at doi:10.1093/mnrasl/slx135.

    Accepted author manuscript (Post-print), 422 KB, PDF document

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