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. M. Bahé; 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. M. Bahé
, 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

Astronomy

Research output: Contribution to journal › Article › peer-review

103 Scopus citations

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 betweenXMM-Newton and Chandra. The mean ratio of X-ray to lensing mass for these 50 clusters is βX = 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 ± 0.04. 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 (US)
Pages (from-to)	L74-L78
Journal	Monthly Notices of the Royal Astronomical Society: Letters
Volume	456
Issue number	1
DOIs	https://doi.org/10.1093/mnrasl/slv175
State	Published - Feb 11 2016

Keywords

Cosmology: observations
Galaxies: clusters: general
Gravitational lensing: weak

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnrasl/slv175

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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. (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

Smith, GP, Mazzotta, P, Okabe, N, Ziparo, F, Mulroy, SL, Babul, A, Finoguenov, A, McCarthy, IG, Lieu, M, Bahé, YM, 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', Monthly Notices of the Royal Astronomical Society: Letters, vol. 456, no. 1, pp. L74-L78. 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 betweenXMM-Newton and Chandra. The mean ratio of X-ray to lensing mass for these 50 clusters is βX = 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 ± 0.04. Based on a careful like-for-like analysis, we find that LoCuSS, the Canadian Cluster Comparison Project, and Weighing the Giants agree on βP = 0.9-0.95 at 0.15 < z < 0.3. This small level of hydrostatic bias disagrees at \textasciitilde{}5σ with the level required to reconcile Planck cosmology results from the cosmic microwave background and galaxy cluster counts.",

keywords = "Cosmology: observations, Galaxies: clusters: general, Gravitational lensing: weak",

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 Bah{\'e}, \{Y. M.\} 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",

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T2 - 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 - Bahé, Y. M.

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.

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 betweenXMM-Newton and Chandra. The mean ratio of X-ray to lensing mass for these 50 clusters is βX = 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 ± 0.04. Based on a careful like-for-like analysis, we find that LoCuSS, the Canadian Cluster Comparison Project, and Weighing the Giants agree on βP = 0.9-0.95 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 betweenXMM-Newton and Chandra. The mean ratio of X-ray to lensing mass for these 50 clusters is βX = 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 ± 0.04. Based on a careful like-for-like analysis, we find that LoCuSS, the Canadian Cluster Comparison Project, and Weighing the Giants agree on βP = 0.9-0.95 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 - Cosmology: observations

KW - Galaxies: clusters: general

KW - Gravitational lensing: weak

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IS - 1

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LoCuSS: Testing hydrostatic equilibrium in galaxy clusters

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Keywords

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