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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 and Umetsu, K (2015) LoCuSS: Testing hydrostatic equilibrium in galaxy clusters. Monthly Notices of the Royal Astronomical Society, 456 (1). L74-L75. ISSN 0035-8711
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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 $M_{500}$ 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 $\beta_{\rm X}=0.95\pm0.05$, and for the 44 clusters also detected by Planck, the mean ratio of Planck mass estimate to LoCuSS lensing mass is $\beta_{\rm P}=0.95\pm0.04$. Based on a careful like-for-like analysis, we find that LoCuSS, the Canadian Cluster Comparison Project (CCCP), and Weighing the Giants (WtG) agree on $\beta_{\rm P}\simeq0.9-0.95$ at $0.15<z<0.3$. This small level of hydrostatic bias disagrees at $\sim5\sigma$ with the level required to reconcile Planck cosmology results from the cosmic microwave background and galaxy cluster counts.
| Item Type: | Article |
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| Additional Information: | This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record LoCuSS: Testing hydrostatic equilibrium in galaxy clusters is available online at: http://dx.doi.org/10.1093/mnrasl/slv175 |
| Uncontrolled Keywords: | astro-ph.CO; astro-ph.CO |
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Astrophysics Research Institute |
| Publisher: | Oxford University Press |
| Related URLs: | |
| Date Deposited: | 06 Jan 2016 12:42 |
| Last Modified: | 02 Mar 2022 10:38 |
| DOI or ID number: | 10.1093/mnrasl/slv175 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/2520 |
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