The Three Hundred Project: Backsplash galaxies in simulations of clusters
| Autor: | Alexander Knebe, Meghan E. Gray, Roan Haggar, Frazer R. Pearce, Weiguang Cui, Gustavo Yepes, Robert Mostoghiu |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
education.field_of_study 010308 nuclear & particles physics Population FOS: Physical sciences Astronomy and Astrophysics Radius Astrophysics 01 natural sciences Astrophysics - Astrophysics of Galaxies Galaxy Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Cluster (physics) education 010303 astronomy & astrophysics Galaxy cluster |
| Zdroj: | Monthly Notices of the Royal Astronomical Society |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.48550/arxiv.2001.11518 |
| Popis: | In the outer regions of a galaxy cluster, galaxies may be either falling into the cluster for the first time, or have already passed through the cluster centre at some point in their past. To investigate these two distinct populations, we utilise TheThreeHundred project, a suite of 324 hydrodynamical resimulations of galaxy clusters. In particular, we study the 'backsplash population' of galaxies; those that have passed within $R_{200}$ of the cluster centre at some time in their history, but are now outside of this radius. We find that, on average, over half of all galaxies between $R_{200}$ and $2R_{200}$ from their host at $z=0$ are backsplash galaxies, but that this fraction is dependent on the dynamical state of a cluster, as dynamically relaxed clusters have a greater backsplash fraction. We also find that this population is mostly developed at recent times ($z\leq0.4$), and is dependent on the recent history of a cluster. Finally, we show that the dynamical state of a given cluster, and thus the fraction of backsplash galaxies in its outskirts, can be predicted based on observational properties of the cluster. Comment: 13 pages, 12 figures, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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