The Three Hundred project: shapes and radial alignment of satellite, infalling, and backsplash galaxies

Knebe, Alexander; G�mez-Mar�n, Mat�as; Pearce, Frazer R; Cui, Weiguang; Hoffmann, Kai; De�Petris, Marco; Power, Chris; Haggar, Roan; Mostoghiu, Robert

Abstract

Using 324 numerically modelled galaxy clusters, we investigate the radial and galaxy–halo alignment of dark matter subhaloes and satellite galaxies orbiting within and around them. We find that radial alignment depends on distance to the centre of the galaxy cluster but appears independent of the dynamical state of the central host cluster. Furthermore, we cannot find a relation between radial alignment of the halo or galaxy shape with its own mass. We report that backsplash galaxies, i.e. objects that have already passed through the cluster radius but are now located in the outskirts, show a stronger radial alignment than infalling objects. We further find that there exists a population of well radially aligned objects passing very close to the central cluster’s centre that were found to be on highly radial orbit.

Citation

Knebe, A., Gámez-Marín, M., Pearce, F. R., Cui, W., Hoffmann, K., De Petris, M., …Mostoghiu, R. (2020). The Three Hundred project: shapes and radial alignment of satellite, infalling, and backsplash galaxies. Monthly Notices of the Royal Astronomical Society, 495(3), 3002-3013. https://doi.org/10.1093/mnras/staa1407

• Journal Article Type: Article
• Acceptance Date: May 18, 2020
• Online Publication Date: May 21, 2020
• Publication Date: 2020-07
• Deposit Date: Oct 28, 2020
• Publicly Available Date: Oct 28, 2020
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 495
• Issue: 3
• Pages: 3002-3013
• DOI: https://doi.org/10.1093/mnras/staa1407
• Keywords: Space and Planetary Science; Astronomy and Astrophysics
• Public URL: https://nottingham-repository.worktribe.com/output/4996405
• Publisher URL: https://academic.oup.com/mnras/article-abstract/495/3/3002/5841538
• Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society; ©2020 Alexander Knebe, Matías Gámez-Marín, Frazer R Pearce, Weiguang Cui, Kai Hoffmann, Marco De Petris, Chris Power, Roan Haggar, Robert Mostoghiu. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.