Cosmic filaments in galaxy cluster outskirts: quantifying finding filaments in redshift space

Author:

Kuchner Ulrike1ORCID,Aragón-Salamanca Alfonso1ORCID,Rost Agustín2ORCID,Pearce Frazer R1,Gray Meghan E1,Cui Weiguang3ORCID,Knebe Alexander456ORCID,Rasia Elena78,Yepes Gustavo45

Affiliation:

1. School of Physics & Astronomy, University of Nottingham, Nottingham NG7 2RD, UK

2. Instituto de Astronomía Teórica y Experimental, Universidad Nacional de Córdoba, X5000BGR Córdoba, Argentina

3. Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ, UK

4. Departamento de Física Teórica, Módulo 15, Facultad de Ciencias, Universidad Autónoma de Madrid, E-28049 Madrid, Spain

5. Centro de Investigación Avanzada en Física Fundamental (CIAFF), Facultad de Ciencias, Universidad Autónoma de Madrid, E-28049 Madrid, Spain

6. International Centre for Radio Astronomy Research, The University of Western Australia, Crawley, Western Australia 6009, Australia

7. Osservatorio Astronomico di Trieste, Istituto Nazionale di Astrofisica, 11, I-34131 Trieste, Italy

8. Institute for Fundamental Physics of the Universe, I-34014 Trieste, Italy

Abstract

ABSTRACT Inferring line-of-sight distances from redshifts in and around galaxy clusters is complicated by peculiar velocities, a phenomenon known as the ‘Fingers of God’ (FoG). This presents a significant challenge for finding filaments in large observational data sets as these artificial elongations can be wrongly identified as cosmic web filaments by extraction algorithms. Upcoming targeted wide-field spectroscopic surveys of galaxy clusters and their infall regions, such as the WEAVE Wide-Field Cluster Survey, motivate our investigation of the impact of FoG on finding filaments connected to clusters. Using zoom-in resimulations of 324 massive galaxy clusters and their outskirts from the three hundred project, we test methods typically applied to large-scale spectroscopic data sets. This paper describes our investigation of whether a statistical compression of the FoG of cluster centres and galaxy groups can lead to correct filament extractions in the cluster outskirts. We find that within 5R200 (∼15 h−1 Mpc) statistically correcting for FoG elongations of virialized regions does not achieve reliable filament networks compared to reference filament networks based on true positions. This is due to the complex flowing motions of galaxies towards filaments in addition to the cluster infall, which overwhelm the signal of the filaments relative to the volume that we probe. While information from spectroscopic redshifts is still important to isolate the cluster regions, and thereby reduce background and foreground interlopers, we expect future spectroscopic surveys of galaxy cluster outskirts to rely on 2D positions of galaxies to extract cosmic filaments.

Funder

Horizon 2020

Science and Technology Facilities Council

FEDER

INAF

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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