.png){kind=icon}
返回
Improved two-point correlation function estimates using glass-like distributions as a reference sample
.png){kind=icon}
OA
AI
DOI：10.1093/mnras/stab1622.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
All estimators of the two-point correlation function are based on a random catalogue, a set of points with no intrinsic clustering following the selection function of a survey. High-accuracy estimates require the use of large random catalogues, which imply a high computational cost. We propose to replace the standard random catalogues by glass-like point distributions or glass catalogues whose power spectrum P(k) proportional to k(4) exhibits significantly less power on scales larger than the mean interparticle separation than a Poisson distribution with the same number of points. We show that these distributions can be obtained by iteratively applying the technique of Zeldovich reconstruction commonly used in studies of baryon acoustic oscillations (BAO). We provide a modified version of the widely used Landy-Szalay estimator of the correlation function adapted to the use of glass catalogues and compare its performance with the results obtained using random samples. Our results show that glass-like samples do not add any bias with respect to the results obtained using Poisson distributions. On scales larger than the mean interparticle separation of the glass catalogues, the modified estimator leads to a significant reduction of the variance of the Legendre multipoles xi(l)(s) with respect to the standard Landy-Szalay results with the same number of points. The size of the glass catalogue required to achieve a given accuracy in the correlation function is significantly smaller than when using random samples. Their use could help us to drastically reduce the computational cost of configuration-space clustering analysis of future surveys while maintaining high-accuracy requirements.
Keyword:
methods: analytical
methods: statistical
galaxies: statistics
large-scale structure of Universe
期刊
IF:
4.8
论文数:
7.1W
被引数:
25.0W
机构
引用论文
The clustering of galaxies in the completed SDSS-III Baryon Oscillation Spectroscopic Survey: cosmological analysis of the DR12 galaxy sample完成的sdss-iii重子振荡光谱调查中的星系聚类: DR12星系样品的宇宙学分析
OAAI
.png){kind=icon}
OAAI分享收藏Flow cytometry detection of Shiga toxins in the blood from children with hemolytic uremic syndrome
PREAI
分享收藏Ca2+-activated potassium (KCa) channel inhibition decreases neuronal activity–blood flow coupling
PREAI
分享收藏分享收藏
查看更多内容