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We present a joint weak-lensing/X-ray study of galaxy cluster mass-observablescaling relations, motivated by the critical importance of accurate calibrationof mass proxies for future X-ray missions, including eROSITA. We use a sampleof 12 clusters at z\simeq0.2 that we have observed with Subaru and XMM-Newtonto construct relationships between the weak-lensing mass (M), and three X-rayobservables: gas temperature (T), gas mass (Mgas), and quasi-integrated gaspressure (Yx) at overdensities of \Delta=2500, 1000, and 500 with respect tothe critical density. We find that Mgas at \Delta\le1000 appears to be the mostpromising mass proxy of the three, because it has the lowest intrinsic scatterin mass at fixed observable: \sigma_lnM\simeq0.1, independent of clusterdynamical state. The scatter in mass at fixed T and Yx is a factor of \sim2-3larger than at fixed Mgas, which are indicative of the structural segregationthat we find in the M-T and M-Yx relationships. Undisturbed clusters are foundto be \sim40% and \sim20% more massive than disturbed clusters at fixed T andYx respectively at \sim2\sigma significance. In particular, A1914 - awell-known merging cluster - significantly increases the scatter and lowers thethe normalization of the relation for disturbed clusters. We also investigatedthe covariance between intrinsic scatter in M-Mgas and M-T relations, findingthat they are positively correlated. This contradicts the adaptive meshrefinement simulations that motivated the idea that Yx may be a low scattermass proxy, and agrees with more recent smoothed particle hydrodynamicsimulations based on the Millennium Simulation. We also propose a method toidentify a robust mass proxy based on principal component analysis. Thestatistical precision of our results are limited by the small sample size andthe presence of the extreme merging cluster in our sample.

LoCuSS: Calibrating Mass-Observable Scaling Relations for Cluster Cosmology with Subaru Weak Lensing Observations