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We present weak lensing and X-ray analysis of 12 low mass clusters from theCFHTLenS and XMM-CFHTLS surveys. We combine these systems with high-masssystems from CCCP and low-mass systems from COSMOS to obtain a sample of 70systems, spanning over two orders of magnitude in mass. We measure core-excisedLx-Tx, M-Lx and M-Tx scaling relations and include corrections forobservational biases. By providing fully bias corrected relations, we give thecurrent limitations for Lx and Tx as cluster mass proxies. We demonstrate thatTx benefits from a significantly lower intrinsic scatter at fixed mass than Lx.By studying the residuals of the bias corrected relations, we show for thefirst time using weak lensing masses that galaxy groups seem more luminous andwarmer for their mass than clusters. This implies a steepening of the M-Lx andM-Tx relations at low masses. We verify the inferred steepening using adifferent high mass sample from the literature and show that variance betweensamples is the dominant effect leading to discrepant scaling relations. Wedivide our sample into subsamples of merging and relaxed systems, and find thatmergers may have enhanced scatter in lensing measurements, most likely due tostronger triaxiality and more substructure. For the Lx-Tx relation, which isunaffected by lensing measurements, we find the opposite trend in scatter. Wealso explore the effects of X-ray cross-calibration and find that Chandracalibration leads to flatter Lx-Tx and M-Tx relations than XMM-Newton.

CFHTLenS: Weak lensing calibrated scaling relations for low mass clusters of galaxies