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LoCuSS: Testing hydrostatic equilibrium in galaxy clusters

Smith, G.P.; Mazzotta, P.; Okabe, N.; Ziparo, F.; Mulroy, S.L.; Babul, A.; Finoguenov, A.; McCarthy, I.G.; Lieu, M.; Bahé, Y.M.; Bourdin, H.; Evrard, A.E.; Futamase, T.; Haines, C.P.; Jauzac, M.; Marrone, D.P.; Martino, R.; May, P.E.; Taylor, J.E.; Umetsu, K.

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Authors

G.P. Smith

P. Mazzotta

N. Okabe

F. Ziparo

S.L. Mulroy

A. Babul

A. Finoguenov

I.G. McCarthy

M. Lieu

Y.M. Bahé

H. Bourdin

A.E. Evrard

T. Futamase

C.P. Haines

D.P. Marrone

R. Martino

P.E. May

J.E. Taylor

K. Umetsu



Abstract

We test the assumption of hydrostatic equilibrium in an X-ray luminosity selected sample of 50 galaxy clusters at 0.15 < z < 0.3 from the Local Cluster Substructure Survey (LoCuSS). Our weak-lensing measurements of M500 control systematic biases to sub-4 per cent, and our hydrostatic measurements of the same achieve excellent agreement between XMM–Newton and Chandra. The mean ratio of X-ray to lensing mass for these 50 clusters is βX=0.95±0.05βX=0.95±0.05, and for the 44 clusters also detected by Planck, the mean ratio of Planck mass estimate to LoCuSS lensing mass is βP=0.95±0.04βP=0.95±0.04. Based on a careful like-for-like analysis, we find that LoCuSS, the Canadian Cluster Comparison Project, and Weighing the Giants agree on βP≃0.9−0.95βP≃0.9−0.95 at 0.15 < z < 0.3. This small level of hydrostatic bias disagrees at ∼5σ with the level required to reconcile Planck cosmology results from the cosmic microwave background and galaxy cluster counts.

Citation

Smith, G., Mazzotta, P., Okabe, N., Ziparo, F., Mulroy, S., Babul, A., …Umetsu, K. (2016). LoCuSS: Testing hydrostatic equilibrium in galaxy clusters. Monthly Notices of the Royal Astronomical Society: Letters, 456(1), L74-L78. https://doi.org/10.1093/mnrasl/slv175

Journal Article Type Article
Acceptance Date Nov 4, 2015
Online Publication Date Dec 2, 2015
Publication Date Feb 11, 2016
Deposit Date Feb 10, 2016
Publicly Available Date Mar 29, 2024
Journal Monthly Notices of the Royal Astronomical Society: Letters
Electronic ISSN 1745-3933
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 456
Issue 1
Pages L74-L78
DOI https://doi.org/10.1093/mnrasl/slv175
Keywords Gravitational lensing: weak, Galaxies: clusters: general, Cosmology: observations.

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters ©: 2016 The Author Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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