Year: 2024
Type: article
Abstract: Filaments connected to galaxy clusters are crucial environments for studying the build up of cosmic structures as they funnel matter towards the clusters’ deep gravitational potentials. Identifying gas in filaments is a challenge, due to their lower density contrast, which produces faint signals. Therefore, the best opportunity to detect these signals is in the outskirts of galaxy clusters. We revisited the X-ray observation of the cluster Abell 2744, using statistical estimators of the anisotropic matter distribution to identify filamentary patterns around it. We report, for the first time, the blind detection of filaments connected to a galaxy cluster from X-ray emission using a filament-finder technique and a multipole decomposition technique. We compare this result with filaments extracted from the distribution of spectroscopic galaxies using the same two approaches. This allowed us to demonstrate the robustness and reliability of our techniques in tracing the filamentary structure of three and five filaments connected to Abell 2744, in two and three dimensions, respectively.
Source: Astronomy and Astrophysics
Authors: S. Gallo, N. Aghanim, C. Gouin, D. Eckert, M. Douspis, J. Paste, T. Bonnaire
Institutions: Centre National de la Recherche Scientifique, Université Paris-Saclay, Institut d'Astrophysique Spatiale, Institut d'Astrophysique de Paris, Sorbonne Université, University of Geneva, Lyon 1 Université, Université Paris Cité, Université Paris Sciences et Lettres, École Normale Supérieure - PSL, Laboratoire de Physique de l'Ecole Normale Supérieure
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,732
OpenAlex ID: W4404788253