The uniformity and time-invariance of the intra-cluster metal distribution in galaxy clusters from the IllustrisTNG simulations
Name
1707.05318.pdf
Description
Accepted version
Size
5.8 MB
Format
Adobe PDF
Checksum (MD5)
400f52a701879ca3c06a5f6156655375
Author(s)
Vogelsberger, Mark
Marinacci, Federico
Torrey, Paul
Genel, Shy
Springel, Volker
Weinberger, Rainer
Pakmor, Rüdiger
Hernquist, Lars
Naiman, Jill
Pillepich, Annalisa
Date Issued
2018
Journal
Monthly Notices of the Royal Astronomical Society
Publisher
Oxford University Press (OUP)
Version
Author's final manuscript
Abstract
© 2017 The Author(s). The distribution of metals in the intra-cluster medium (ICM) encodes important information about the enrichment history and formation 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1093/MNRAS/STX2955
