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

Alexander Knebe, Matías Gámez-Marín, Frazer R. Pearce, Weiguang Cui, Kai Hoffmann, Marco De Petris, Chris Power, Roan Haggar, Robert Mostoghiu

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)3002-3013
JournalMonthly Notices of the Royal Astronomical Society
Volume495
Issue number3
DOIs
Publication statusPublished - May 2020

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