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Abstract

The \(\beta\)-skeleton is a mathematical method to construct graphs from a set of points that has been widely applied in the areas of image analysis, machine learning, visual perception, and pattern recognition. In this work, we apply the \(\beta\)-skeleton to study the cosmic web. We use this tool on observed and simulated data to identify the filamentary structures and characterize the statistical properties of the skeleton. In particular, we compare the \(\beta\)-skeletons built from SDSS-III galaxies to those obtained from MD-PATCHY mocks, and also to mocks directly built from the Big MultiDark \(N\)-body simulation. We find that the \(\beta\)-skeleton is able to reveal the underlying structures in observed and simulated samples without any parameter fine-tuning. A different degree of sparseness can be obtained by adjusting the value of \(\beta\); in addition, the statistical properties of the length and direction of the skeleton connections show a clear dependence on redshift space distortions (RSDs), cosmological effects and galaxy bias. We also find that the \(N\)-body simulation accurately reproduces the RSD effect in the data, while the MD-PATCHY mocks appear to underestimate its magnitude. Our proof-of-concept study shows that the statistical properties of the \(\beta\)-skeleton can be used to probe cosmological parameters and galaxy evolution.

Details

1009240
Title
Beta-Skeleton Analysis of the Cosmic Web
Publication title
arXiv.org; Ithaca
Publication year
2018
Publication date
Sep 6, 2018
Section
Astrophysics
Publisher
Cornell University Library, arXiv.org
Source
arXiv.org
Place of publication
Ithaca
Country of publication
United States
University/institution
Cornell University Library arXiv.org
e-ISSN
2331-8422
Source type
Working Paper
Language of publication
English
Document type
Working Paper
Publication history
 
 
Online publication date
2019-04-10
Milestone dates
2018-09-03 (Submission v1); 2018-09-06 (Submission v2)
Publication history
 
 
   First posting date
10 Apr 2019
ProQuest document ID
2099742974
Document URL
https://www.proquest.com/working-papers/beta-skeleton-analysis-cosmic-web/docview/2099742974/se-2?accountid=208611
Full text outside of ProQuest
Copyright
© 2018. This work is published under http://arxiv.org/licenses/nonexclusive-distrib/1.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.
Last updated
2019-04-11
Database
ProQuest One Academic