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

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 which were found to be on highly radial orbit.

14 pages, accepted for publication in MNRAS

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• An inventory of galaxies in cosmic filaments feeding galaxy clusters: galaxy groups, backsplash galaxies, and pristine galaxies
• Characterising the intra-cluster light in The Three Hundred simulations
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• What to expect from dynamical modelling of cluster haloes II. Investigating dynamical state indicators with Random Forest
• Modeling Intrinsic Galaxy Alignment in the MICE Simulation
• The Three Hundred: Cluster Dynamical States and Relaxation Time Scale
• The Three Hundred project: Galaxy groups do not survive cluster infall
• What to expect from dynamical modelling of cluster haloes I. The information content of different dynamical tracers
• The Three Hundred Project: the evolution of physical baryon profiles
• There and back again: understanding the critical properties of backsplash galaxies
• Brightest Cluster Galaxies Trace Weak Lensing Mass Bias and Halo Triaxiality in The Three Hundred Project
• Reconsidering the dynamical states of galaxy clusters using PCA and UMAP
• The impact of galaxy selection on the splashback boundaries of galaxy clusters
• Living with Neighbors. III. The Origin of the Spin$-$Orbit Alignment of Galaxy Pairs: A Neighbor versus the Large-scale Structure
• Backsplash galaxies and their impact on galaxy evolution: a three-stage, four-type perspective
• Protoclusters at z=5.7: A view from the MultiDark galaxies
• Intrinsic mass-richness relation of clusters from THE THREE HUNDRED hydrodynamic simulations
• The THREEHUNDRED project: the effect of baryon processes at galaxy cluster scale
• Mock Observations: Three Different Types of Galaxy Alignment in TNG100 Simulations
• The Three Hundred Project hydrodynamical simulations: Hydrodynamical weak-lensing cluster mass biases and richnesses using different hydro models
• Galaxy cluster mass bias from projected mass maps: The Three Hundred-NIKA2 LPSZ twin samples
• The impact of halo concentration on the Sunyaev Zel'dovich effect signal from massive galaxy clusters
• Distinguishing Orbiting and Infalling Dark Matter Particles with Machine Learning
• Deep Learning generated observations of galaxy clusters from dark-matter-only simulations
• Shape asymmetries and the relation between lopsidedness and radial alignment in simulated galaxies