.png){kind=icon}
返回
Cosmic web reconstruction through density ridges: method and algorithm
.png){kind=icon}
OA
AI
DOI：10.1093/mnras/stv1996.png)
.png){kind=icon}
.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
The detection and characterization of filamentary structures in the cosmic web allows cosmologists to constrain parameters that dictate the evolution of the Universe. While many filament estimators have been proposed, they generally lack estimates of uncertainty, reducing their inferential power. In this paper, we demonstrate how one may apply the subspace constrained mean shift (SCMS) algorithm (Ozertem & Erdogmus 2011; Genovese et al. 2014) to uncover filamentary structure in galaxy data. The SCMS algorithm is a gradient ascent method that models filaments as density ridges, one-dimensional smooth curves that trace high-density regions within the point cloud. We also demonstrate how augmenting the SCMS algorithm with bootstrap-based methods of uncertainty estimation allows one to place uncertainty bands around putative filaments. We apply the SCMS first to the data set generated from the Voronoi model. The density ridges show strong agreement with the filaments from Voronoi method. We then apply the SCMS method data sets sampled from a P3M N-body simulation, with galaxy number densities consistent with SDSS and WFIRST-AFTA, and to LOWZ and CMASS data from the Baryon Oscillation Spectroscopic Survey (BOSS). To further assess the efficacy of SCMS, we compare the relative locations of BOSS filaments with galaxy clusters in the redMaPPer catalogue, and find that redMaPPer clusters are significantly closer (with p-values <10(-9)) to SCMS-detected filaments than to randomly selected galaxies.
Keyword:
methods: data analysis
methods: statistical
cosmology: observations
large-scale structure of Universe
AI总结
对已上传原文的论文进行重点信息的提取，主要内容包括：简要概述、研究摘要、背景介绍、关键亮点、图文解析、展望与总结。
期刊
IF:
4.8
论文数:
7.0W
被引数:
25.0W
机构
引用论文
New york university value-added galaxy catalog: A galaxy catalog based on new public surveys.png)
ASTRONOMICAL JOURNALOAAI
ASTRONOMICAL JOURNALIF5.1
OAAI分享收藏分享收藏redMaPPer - III. A detailed comparison of the Planck 2013 and SDSS DR8 redMaPPer cluster cataloguesOAAI
OAAI分享收藏SPECTRAL CLASSIFICATION AND REDSHIFT MEASUREMENT FOR THE SDSS-III BARYON OSCILLATION SPECTROSCOPIC SURVEYSdss-iii重子振荡光谱测量的光谱分类和红移测量ASTRONOMICAL JOURNALOAAI
ASTRONOMICAL JOURNALIF5.1
OAAI分享收藏
查看更多内容