Constraining the inner density slope of massive galaxy clusters

He, Qiuhan; Li, Hongyu; Li, Ran; Frenk, Carlos S; Schaller, Matthieu; Barnes, David; Bahé, Yannick; Kay, Scott T; Gao, Liang; Vecchia, Claudio Dalla

doi:10.1093/mnras/staa1769

Constraining the inner density slope of massive galaxy clusters

He, Qiuhan; Li, Hongyu; Li, Ran; Frenk, Carlos S; Schaller, Matthieu; Barnes, David; Bahé, Yannick; Kay, Scott T; Gao, Liang; Vecchia, Claudio Dalla

Authors

Dr Qiuhan He qiuhan.he@durham.ac.uk
Post Doctoral Research Associate

Hongyu Li

Ran Li

Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor

Matthieu Schaller

David Barnes

Yannick Bahé

Scott T Kay

Liang Gao

Claudio Dalla Vecchia

Abstract

We determine the inner density profiles of massive galaxy clusters (M200 > 5 × 1014 M⊙) in the Cluster-EAGLE (C-EAGLE) hydrodynamic simulations, and investigate whether the dark matter density profiles can be correctly estimated from a combination of mock stellar kinematical and gravitational lensing data. From fitting mock stellar kinematics and lensing data generated from the simulations, we find that the inner density slopes of both the total and the dark matter mass distributions can be inferred reasonably well. We compare the density slopes of C-EAGLE clusters with those derived by Newman et al. for 7 massive galaxy clusters in the local Universe. We find that the asymptotic best-fit inner slopes of “generalized” NFW (gNFW) profiles, γgNFW, of the dark matter haloes of the C-EAGLE clusters are significantly steeper than those inferred by Newman et al. However, the mean mass-weighted dark matter density slopes of the simulated clusters are in good agreement with the Newan et al. estimates. We also find that the estimate of γgNFW is very sensitive to the constraints from weak lensing measurements in the outer parts of the cluster and a bias can lead to an underestimate of γgNFW.

Citation

He, Q., Li, H., Li, R., Frenk, C. S., Schaller, M., Barnes, D., …Vecchia, C. D. (2020). Constraining the inner density slope of massive galaxy clusters. Monthly Notices of the Royal Astronomical Society, 496(4), 4717-4733. https://doi.org/10.1093/mnras/staa1769

Journal Article Type	Article
Acceptance Date	Jun 9, 2020
Online Publication Date	Jun 19, 2020
Publication Date	2020-08
Deposit Date	Jun 21, 2020
Publicly Available Date	May 26, 2021
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	496
Issue	4
Pages	4717-4733
DOI	https://doi.org/10.1093/mnras/staa1769

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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.