Projects per year
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 |
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Pages (from-to) | L74-78 |
Journal | Royal Astronomical Society. Monthly Notices |
Volume | 456 |
Early online date | 2 Dec 2015 |
DOIs | |
Publication status | Published - 11 Feb 2016 |
Bibliographical note
5 pages, 1 figure, accepted by MNRASKeywords
- astro-ph.CO
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Dive into the research topics of 'LoCuSS: Testing hydrostatic equilibrium in galaxy clusters'. Together they form a unique fingerprint.Projects
- 2 Finished
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Birmingham Astrophysics : Consolidated Grant 2013-2016
Vecchio, A., Ponman, T., Freise, A., Smith, G., Speake, C., Mandel, I., Cruise, M., Raychaudhury, S. & Stevens, I.
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/04/13 → 30/09/16
Project: Research Councils
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UK Involvement in the Advanced LIGO Gravitational Wave Project
Vecchio, A., Castelli, C. & Cruise, M.
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/06/03 → 31/03/11
Project: Research Councils