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.
The Three Hundred project: shapes and radial alignment of satellite, infalling, and backsplash galaxies / Mostoghiu, Robert; Haggar, Roan; Power, Chris; De , ; Petris, Marco; Hoffmann, Kai; Cui, Weiguang; Pearce, Frazer R; Gámez-Marín, Matías; Knebe, Alexander. - In: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. - ISSN 0035-8711. - 495:3(2020), pp. 3002-3013. [10.1093/mnras/staa1407]
The Three Hundred project: shapes and radial alignment of satellite, infalling, and backsplash galaxies
Petris, Marco;
2020
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.File | Dimensione | Formato | |
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Knebe_The Three Hundred_2020.pdf
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Note: https://academic-oup-com.ezproxy.uniroma1.it/mnras/article/495/3/3002/5841538
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