Comparison between Planck SZ halo mass proxy, and richness (similar to the definition of Rykoff et al. (2014). The mass-richness relation from Rozo et al. (2015) is overplotted. The grey + symbols show the distribution of a simulated sample with redshift z> 0.5 and measured significance S/N> 3.5, and is thus similar to the population from which our candidates have been selected. Both intrinsic and statistical scatter in the richness have been included, but most of the scatter in the grey distribution is caused by statistical uncertainties in the SZ mass proxy. The effect of Eddington bias is apparent, since it causes the observed points to deviate from the intrinsic relation. Our criteria to confirm cluster counterparts (solid error bars) are described in Sect. 5.3, and are largely based on the grey dashed line. Three Planck detections are highlighted in colour, and these are discussed in detail in Sect. 6.
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