The 400d Galaxy Cluster Survey weak lensing programme: III: Evidence for consistent WL and X-ray masses at $z\approx 0.5$

Understand

Scaling properties of galaxy cluster observables with mass provide central insights into the processes shaping clusters.

• Calibrating proxies for cluster mass will be crucial to cluster cosmology with upcoming surveys like eROSITA and Euclid.
• The recent Planck results led to suggestions that X-ray masses might be biased low by $\sim\!40$ %, more than previously considered.
• We extend the direct calibration of the weak lensing -- X-ray mass scaling towards lower masses (as low as $1\!\times\!10^{14}\,\mathrm{M}_{\odot}$) in a sample representative of the $z\!\sim\!0.4$--$0.5$ population.