The mass-concentration relation in lensing clusters: the role of statistical biases and selection effects

Understand

The relation between mass and concentration of galaxy clusters traces their formation and evolution.

• Massive lensing clusters were observed to be over-concentrated and following a steep scaling in tension with predictions from the concordance $\Lambda$CDM paradigm.
• We critically revise the relation in the CLASH, the SGAS, the LOCUSS, and the high-redshift samples of weak lensing clusters.
• Measurements of mass and concentration are anti-correlated, which can bias the observed relation towards steeper values.