A comparison of cosmological filaments catalogues

TL;DR

This paper compares three different algorithms for identifying cosmological filaments in the Sloan Digital Sky Survey, revealing that filament properties vary significantly with the detection method used.

Contribution

It provides a systematic comparison of filament catalogues from different algorithms, highlighting how identification techniques influence filament statistical and physical properties.

Findings

Filament properties depend strongly on the identification algorithm.

Shorter filaments tend to have higher galaxy overdensities and more red galaxies.

Filament length primarily influences galaxy overdensity and luminosity characteristics.

Abstract

In this work we compare three catalogues of cosmological filaments identified in the Sloan Digital Sky Survey by means of different algorithms by Tempel et al., Pereyra et al., and Mart\'inez et al. We analyse how different identification techniques determine differences in the filament statistical properties: length, elongation, redshift distribution, and abundance. We find that the statistical properties of the filaments strongly depend on the identification algorithm. We use a volume limited sample of galaxies to characterise other properties of filaments such as: galaxy overdensity, luminosity function of galaxies, mean galaxy luminosity, filament luminosity, and the overdensity profile of galaxies around filaments. In general, we find that these properties primarily depended on filament length. Shorter filaments have larger overdensities, are more populated by red galaxies, and have better defined galaxy overdensity profiles, than longer filaments. Concluding that galaxies belonging to filaments have characteristic signatures depending on the identification algorithm used.