Using angular pair upweighting to improve 3D clustering measurements

Understand

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).