LoCuSS: Testing hydrostatic equilibrium in galaxy clusters
  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.
