COWS: a filament finder for Hessian cosmic web identifiers

Author:

Pfeifer Simon1,Libeskind Noam I12ORCID,Hoffman Yehuda3,Hellwing Wojciech A4,Bilicki Maciej4ORCID,Naidoo Krishna45

Affiliation:

1. Leibniz-Institut für Astrophysik Potsdam , An der Sternwarte 16, D-14482 Potsdam, Germany

2. Univ Lyon, Univ Claude Bernard Lyon 1, CNRS , IP2I Lyon / IN2P3, IMR 5822, F-69622, France

3. Racah Institute of Physics, Hebrew University , Jerusalem 91904, Israel

4. Center for Theoretical Physics, Polish Academy of Sciences , Al. Lotników 32/46, PL-02-668 Warsaw, Poland

5. Department of Physics & Astronomy, University College London , Gower Stree, London WC1E 6BT, UK

Abstract

ABSTRACT The large-scale galaxy and matter distribution is often described by means of the cosmic web made up of voids, sheets, filaments, and knots. Many different recipes exist for identifying this cosmic web. Here, we focus on a sub-class of cosmic web identifiers, based on the analysis of the Hessian matrix, and proposed a method, called COsmic Web Skeleton (COWS), of separating a set of filaments cells into an ensemble of individual discreet filaments. Specifically, a thinning algorithm is applied to velocity shear tensor-based cosmic web (V-web) to identify the spine of the filaments. This results in a set of filaments with well-defined end point and length. It is confirmed that these sit at local density ridges and align with the appropriate direction defined by the underlying velocity field. The radial density profile of these curved cylindrical filaments, as well as the distribution of their lengths is also examined. The robustness of all results is checked against resolution and the V-web threshold. The code for the COWS method has been made publicly available.

Funder

Israel Science Foundation

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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1. Newtonian Gravity and Galaxy Rotation Curves: An Axisymmetric Green’s Function Perspective;International Journal of Theoretical Physics;2024-08-20

2. Statistical properties of filaments in the cosmic web;Monthly Notices of the Royal Astronomical Society;2024-08-07

3. Evolution of cosmic filaments in the MTNG simulation;Astronomy & Astrophysics;2024-04

4. Hierarchical reconstruction of the cosmic web, the H-Spine method;Monthly Notices of the Royal Astronomical Society;2024-02-15

5. Hierarchical structure of the cosmic web and galaxy properties;Monthly Notices of the Royal Astronomical Society;2023-11-02

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