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The uniformity and time-invariance of the intra-cluster metal distribution in galaxy clusters from the IllustrisTNG simulations

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The distribution of metals in the intra-cluster medium (ICM) encodes important information about the enrichment history and ormation of galaxy clusters. Here, we explore the metal content of clusters in IllustrisTNG - a new suite of galaxy formation simulations building on the Illustris project. Our...

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Main Authors: Vogelsberger, Mark (Author) , Marinacci, Federico (Author) , Torrey, Paul (Author) , Genel, Shy (Author) , Springel, Volker (Author) , Weinberger, Rainer (Author) , Pakmor, Rüdiger (Author) , Hernquist, Lars (Author) , Naiman, Jill P. (Author) , Pillepich, Annalisa (Author) , Nelson, Dylan (Author)
Format: Article (Journal)
Language:English
Published: 2018
In: Monthly notices of the Royal Astronomical Society
Year: 2018, Volume: 474, Issue: 2, Pages: 2073-2093
ISSN:1365-2966
DOI:10.1093/mnras/stx2955
Online Access:Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1093/mnras/stx2955
Verlag, kostenfrei, Volltext: https://academic.oup.com/mnras/article/474/2/2073/4638539
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Author Notes:Mark Vogelsberger, Federico Marinacci, Paul Torrey, Shy Genel, Volker Springel, Rainer Weinberger, Rüdiger Pakmor, Lars Hernquist, Jill Naiman, Annalisa Pillepich and Dylan Nelson
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Summary:The distribution of metals in the intra-cluster medium (ICM) encodes important information about the enrichment history and ormation of galaxy clusters. Here, we explore the metal content of clusters in IllustrisTNG - a new suite of galaxy formation simulations building on the Illustris project. Our cluster sample contains 20 objects in TNG100 - a ∼(100 Mpc)3 volume simulation with 2 × 18203 resolution elements, and 370 objects in TNG300 - a ∼(300 Mpc)3 volume simulation with 2 × 25003 resolution elements. The z = 0 metallicity profiles agree with observations, and the enrichment history is consistent with observational data going beyond z ∼ 1, showing nearly no metallicity evolution. The abundance profiles vary only minimally within the cluster samples, especially in the outskirts with a relative scatter of ∼ 15 per cent. The average metallicity profile flattens towards the centre, where we find a logarithmic slope of −0.1 compared to −0.5 in the outskirts. Cool core clusters have more centrally peaked metallicity profiles (∼0.8 solar) compared to non-cool core systems (∼0.5 solar), similar to observational trends. Si/Fe and O/Fe radial profiles follow positive gradients. The outer abundance profiles do not evolve below z ∼ 2, whereas the inner profiles flatten towards z = 0. More than ∼ 80 per cent of the metals in the ICM have been accreted from the proto-cluster environment, which has been enriched to ∼0.1 solar already at z ∼ 2. We conclude that the intra-cluster metal distribution is uniform among our cluster sample, nearly time-invariant in the outskirts for more than 10 Gyr, and forms through a universal enrichment history.
Item Description:Advance access publication 2017 November 17
Gesehen am 11.11.2022
Physical Description:Online Resource
ISSN:1365-2966
DOI:10.1093/mnras/stx2955

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