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The Three Hundred Project: the evolution of galaxy cluster density profiles

Mostoghiu, Robert; Knebe, Alexander; Cui, Weiguang; Pearce, Frazer R.; Yepes, Gustavo; Power, Chris; Dave, Romeel; Arth, Alexander

Authors

Robert Mostoghiu

Alexander Knebe

Weiguang Cui

Gustavo Yepes

Chris Power

Romeel Dave

Alexander Arth



Abstract

Recent numerical studies of the dark matter density profiles of massive galaxy clusters (Mhalo > 1015 M) show that their median radial mass density profile remains unchanged up to z > 1, displaying a highly self-similar evolution. We verify this by using the data set of theThe Three Hundred project, i.e. 324 cluster-sized haloes as found in full physics hydrodynamical simulations. We track the progenitors of the mass-complete sample of clusters at z = 0, and find that their median shape is already in place by z = 2.5. However, selecting a dynamically relaxed subsample (∼16 per cent of the clusters), we observe a shift of the scale radius rs towards larger values at earlier times. Classifying the whole sample by formation time, this evolution is understood as a result of a two-phase halo mass accretion process. Early-forming clusters – identified as relaxed today – have already entered their slow accretion phase, hence their mass growth occurs mostly at the outskirts. Late-forming clusters – which are still unrelaxed today – are in their fast accretion phase, thus the central region of the clusters is still growing. We conclude that the density profile of galaxy clusters shows a profound self-similarity out to redshifts z ∼ 2.5. This result holds for both gas and total density profiles when including baryonic physics, as reported here for two rather distinct sub-grid models.

Citation

Mostoghiu, R., Knebe, A., Cui, W., Pearce, F. R., Yepes, G., Power, C., …Arth, A. (2018). The Three Hundred Project: the evolution of galaxy cluster density profiles. Monthly Notices of the Royal Astronomical Society, 483(3), 3390-3403. https://doi.org/10.1093/mnras/sty3306

Journal Article Type Article
Acceptance Date Dec 6, 2018
Online Publication Date Dec 6, 2018
Publication Date Dec 6, 2018
Deposit Date Dec 21, 2018
Publicly Available Date Dec 21, 2018
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 483
Issue 3
Pages 3390-3403
DOI https://doi.org/10.1093/mnras/sty3306
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL https://nottingham-repository.worktribe.com/output/1437310
Publisher URL https://academic.oup.com/mnras/advance-article/doi/10.1093/mnras/sty3306/5232383
Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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