Using angular pair upweighting to improve 3D clustering measurements

被引:26
作者
Percival, Will J. [1 ]
Bianchi, Davide [1 ]
机构
[1] Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg, Portsmouth PO1 3FX, Hants, England
基金
英国科学技术设施理事会; 欧洲研究理事会;
关键词
large-scale structure of Universe; cosmology: observations; MOCK GALAXY CATALOGS;
D O I
10.1093/mnrasl/slx135
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 similar to 10-20 per cent reduction of the variance of the monopole correlation function on the baryon acoustic oscillation scale.
引用
收藏
页码:L40 / L44
页数:5
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