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The scaling between X-ray observables and mass for galaxy clusters and groupsis instrumental for cluster based cosmology and an important probe for thethermodynamics of the intracluster gas. We calibrate a scaling relation betweenthe weak lensing mass and X-ray spectroscopic temperature for 10 galaxy groupsin the COSMOS field, combined with 55 higher mass clusters from the literature.The COSMOS data includes HST imaging and redshift measurements of 46 sourcegalaxies per square arcmin, enabling us to perform unique weak lensingmeasurements of low mass systems. Our sample extends the mass range of thelensing calibrated M-T relation an order of magnitude lower than any previousstudy, resulting in a power-law slope of 1.48$^{+0.13}_{-0.09}$. The slope isconsistent with the self-similar model, predictions from simulations, andobservations of clusters. However, X-ray observations relying on massmeasurements derived under the assumption of hydrostatic equilibrium haveindicated that masses at group scales are lower than expected. Both simulationsand observations suggest that hydrostatic mass measurements can be biased low.Our external weak lensing masses provides the first observational support forhydrostatic mass bias at group level, showing an increasing bias withdecreasing temperature and reaching a level of 30-50% at 1 keV.

Weak Lensing Calibrated M-T Scaling Relation of Galaxy Groups in the COSMOS Field