LoCuSS: Testing hydrostatic equilibrium in galaxy clusters

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

doi:10.1093/mnrasl/slv175

LoCuSS: Testing hydrostatic equilibrium in galaxy clusters

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

Physics and Astronomy

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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 β_X= 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 β_P= 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 β_P ≃ 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.

Original language	English
Pages (from-to)	L74-78
Journal	Royal Astronomical Society. Monthly Notices
Volume	456
Early online date	2 Dec 2015
DOIs	https://doi.org/10.1093/mnrasl/slv175
Publication status	Published - 11 Feb 2016

Bibliographical note

5 pages, 1 figure, accepted by MNRAS

Keywords

astro-ph.CO

Access to Document

10.1093/mnrasl/slv175

Smith_et_al_LoCuSS_Testing_Hydrostatic_Equilibrium_MNRAS
Article published as detailed above, and available online at: http://dx.doi.org/10.1093/mnrasl/slv175 Checked March 2016
Final published version, 187 KBLicence: None: All rights reserved

Birmingham Astrophysics : Consolidated Grant 2013-2016
Vecchio, A. (Principal Investigator), Ponman, T. (Co-Investigator), Freise, A. (Co-Investigator), Smith, G. (Co-Investigator), Speake, C. (Co-Investigator), Mandel, I. (Co-Investigator), Cruise, M. (Co-Investigator), Raychaudhury, S. (Co-Investigator) & Stevens, I. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/04/13 → 30/09/16
Project: Research Councils
UK Involvement in the Advanced LIGO Gravitational Wave Project
Vecchio, A. (Principal Investigator), Castelli, C. (Co-Investigator) & Cruise, M. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/06/03 → 31/03/11
Project: Research Councils

Cite this

Smith, G. P., Mazzotta, P., Okabe, N., Ziparo, F., Mulroy, S. L., Babul, A., Finoguenov, A., McCarthy, I. G., Lieu, M., Bahe, Y., 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. (2016). LoCuSS: Testing hydrostatic equilibrium in galaxy clusters. Royal Astronomical Society. Monthly Notices, 456, L74-78. https://doi.org/10.1093/mnrasl/slv175

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title = "LoCuSS: Testing hydrostatic equilibrium in galaxy clusters",

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 β_X= 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 β_P= 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 β_P ≃ 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.",

keywords = "astro-ph.CO",

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

note = "5 pages, 1 figure, accepted by MNRAS",

year = "2016",

month = feb,

day = "11",

doi = "10.1093/mnrasl/slv175",

language = "English",

volume = "456",

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Smith, GP, Mazzotta, P, Okabe, N, Ziparo, F, Mulroy, SL, Babul, A, Finoguenov, A, McCarthy, IG, Lieu, M, Bahe, Y, Bourdin, H, Evrard, AE, Futamase, T, Haines, CP, Jauzac, M, Marrone, DP, Martino, R, May, PE, Taylor, JE & Umetsu, K 2016, 'LoCuSS: Testing hydrostatic equilibrium in galaxy clusters', Royal Astronomical Society. Monthly Notices, vol. 456, pp. L74-78. https://doi.org/10.1093/mnrasl/slv175

TY - JOUR

T1 - LoCuSS: Testing hydrostatic equilibrium in galaxy clusters

AU - Smith, G. P.

AU - Mazzotta, P.

AU - Okabe, N.

AU - Ziparo, F.

AU - Mulroy, S. L.

AU - Babul, A.

AU - Finoguenov, A.

AU - McCarthy, I. G.

AU - Lieu, M.

AU - Bahe, Y.

AU - Bourdin, H.

AU - Evrard, A. E.

AU - Futamase, T.

AU - Haines, C. P.

AU - Jauzac, M.

AU - Marrone, D. P.

AU - Martino, R.

AU - May, P. E.

AU - Taylor, J. E.

AU - Umetsu, K.

N1 - 5 pages, 1 figure, accepted by MNRAS

PY - 2016/2/11

Y1 - 2016/2/11

N2 - 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 β_X= 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 β_P= 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 β_P ≃ 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.

AB - 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 β_X= 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 β_P= 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 β_P ≃ 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.

KW - astro-ph.CO

U2 - 10.1093/mnrasl/slv175

DO - 10.1093/mnrasl/slv175

M3 - Article

SN - 0035-8711

VL - 456

SP - L74-78

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

ER -

LoCuSS: Testing hydrostatic equilibrium in galaxy clusters

Abstract

Bibliographical note

Keywords

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Projects

Birmingham Astrophysics : Consolidated Grant 2013-2016

UK Involvement in the Advanced LIGO Gravitational Wave Project

Cite this