T-ReX: a graph-based filament detection method - Inria - Institut national de recherche en sciences et technologies du numérique Access content directly
Journal Articles Astronomy and Astrophysics - A&A Year : 2020

T-ReX: a graph-based filament detection method

Tony Bonnaire
Marian Douspis

Abstract

Numerical simulations and observations show that galaxies are not uniformly distributed in the universe but, rather, they are spread across a filamentary structure. In this large-scale pattern, highly dense regions are linked together by bridges and walls, all of them surrounded by vast, nearly-empty areas. While nodes of the network are widely studied in the literature, simulations indicate that half of the mass budget comes from a more diffuse part of the network, which is made up of filaments. In the context of recent and upcoming large galaxy surveys, it becomes essential that we identify and classify features of the Cosmic Web in an automatic way in order to study their physical properties and the impact of the cosmic environment on galaxies and their evolution. In this work, we propose a new approach for the automatic retrieval of the underlying filamentary structure from a 2D or 3D galaxy distribution using graph theory and the assumption that paths that link galaxies together with the minimum total length highlight the underlying distribution. To obtain a smoothed version of this topological prior, we embedded it in a Gaussian mixtures framework. In addition to a geometrical description of the pattern, a bootstrap-like estimate of these regularised minimum spanning trees allowed us to obtain a map characterising the frequency at which an area of the domain is crossed. Using the distribution of halos derived from numerical simulations, we show that the proposed method is able to recover the filamentary pattern in a 2D or 3D distribution of points with noise and outliers robustness with a few comprehensible parameters.
Fichier principal
Vignette du fichier
aa36859-19.pdf (3.71 Mo) Télécharger le fichier
Origin Publication funded by an institution
Loading...

Dates and versions

hal-02903856 , version 1 (21-07-2020)

Licence

Identifiers

Cite

Tony Bonnaire, Nabila Aghanim, Aurélien Decelle, Marian Douspis. T-ReX: a graph-based filament detection method. Astronomy and Astrophysics - A&A, 2020, 637, pp.A18. ⟨10.1051/0004-6361/201936859⟩. ⟨hal-02903856⟩
110 View
83 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More