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The Hydrangea simulations: galaxy formation in and around massive clusters

Bahé, YM and Barnes, DJ and Vecchia, CD and Kay, ST and White, SDM and McCarthy, IG and Schaye, J and Bower, RG and Crain, RA and Theuns, T and Jenkins, A and McGee, SL and Schaller, M and Thomas, PA and Trayford, JW (2017) The Hydrangea simulations: galaxy formation in and around massive clusters. Monthly Notices of the Royal Astronomical Society. ISSN 0035-8711

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Abstract

We introduce the Hydrangea simulations, a suite of 24 cosmological hydrodynamic zoom-in simulations of massive galaxy clusters (M_200c = 10^14-10^15 M_Sun) with baryon particle masses of ~10^6 M_Sun. Designed to study the impact of the cluster environment on galaxy formation, they are a key part of the `Cluster-EAGLE' project (Barnes et al. 2017). They use a galaxy formation model developed for the EAGLE project, which has been shown to yield both realistic field galaxies and hot gas fractions of galaxy groups consistent with observations. The total stellar mass content of the simulated clusters agrees with observations, but central cluster galaxies are too massive, by up to 0.6 dex. Passive satellite fractions are higher than in the field, and at stellar masses Mstar > 10^10 M_Sun this environmental effect is quantitatively consistent with observations. The predicted satellite stellar mass function matches data from local cluster surveys. Normalized to total mass, there are fewer low-mass (Mstar < 10^10 M_Sun) galaxies within the virial radius of clusters than in the field, primarily due to star formation quenching. Conversely, the simulations predict an overabundance of massive galaxies in clusters compared to the field that persists to their far outskirts (> 5r_200c). This is caused by a significantly increased stellar mass fraction of (sub-)haloes in the cluster environment, by up to ~0.3 dex even well beyond r_200c. Haloes near clusters are also more concentrated than equally massive field haloes, but these two effects are largely uncorrelated.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Yannick M. Bahé, David J. Barnes, Claudio Dalla Vecchia, Scott T. Kay, Simon D. M. White, Ian G. McCarthy, Joop Schaye, Richard G. Bower, Robert A. Crain, Tom Theuns, Adrian Jenkins, Sean L. McGee, Matthieu Schaller, Peter A. Thomas, James W. Trayford; The Hydrangea simulations: galaxy formation in and around massive clusters. Mon Not R Astron Soc 2017 stx1403. doi: 10.1093/mnras/stx1403 is available online at: https://doi.org/10.1093/mnras/stx1403
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 27 Jun 2017 09:00
Last Modified: 27 Jun 2017 09:00
DOI or Identification number: 10.1093/mnras/stx1403
URI: http://researchonline.ljmu.ac.uk/id/eprint/6756

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