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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 472卷 / 01期

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

页码：L40 / L44

页数：5

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