LoCuSS: Testing hydrostatic equilibrium in galaxy clusters
Author
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Smith, G. P.
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Mazzotta, P.
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Okabe, N.
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Ziparo, F.
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Mulroy, S. L.
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Babul, A.
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Finoguenov, A.
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McCarthy, I. G.
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Lieu, M.
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Bahé, Y. M.
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Bourdin, H.
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Evrard, A. E.
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Futamase, T.
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Haines, Chris
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Jauzac, M.
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Marrone, D. P.
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Martino, R.
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May, P. E.
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Taylor, J. E.
Author
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Umetsu, K.
Admission date
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2016-05-18T17:11:34Z
Available date
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2016-05-18T17:11:34Z
Publication date
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2016
Cita de ítem
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MNRAS 456, L74–L78 (2016)
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Identifier
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DOI: 10.1093/mnrasl/slv175
Identifier
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https://repositorio.uchile.cl/handle/2250/138365
General note
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Artículo de publicación ISI
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Abstract
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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 beta(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 beta(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 beta(P) similar or equal to 0.9-0.95 at 0.15 < z < 0.3. This small level of hydrostatic bias disagrees at similar to 5 sigma with the level required to reconcile Planck cosmology results from the cosmic microwave background and galaxy cluster counts.