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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

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Dr Qiuhan He
Post Doctoral Research Associate

Hongyu Li

Ran Li

Matthieu Schaller

David Barnes

Yannick Bahé

Scott T Kay

Liang Gao

Claudio Dalla Vecchia


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.


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.

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


Published Journal Article (7 Mb)

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.

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