Year: 2017
Type: article
Abstract: 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 an∼10–20 per cent reduction of the variance of the monopole correlation function on the baryon acoustic oscillation scale.
Authors: Will J. Percival, Davide Bianchi
Institution: University of Portsmouth
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2619784203