ΣSFR/richness (in units of M⊙ yr-1) as a function of the average r-band galaxy density within each region. Richnesses and densities are estimated using galaxies brighter than 7 × 109 L⊙ in the r-band. Different symbols identify the three different regions, as in Fig. 12, and the filled black diamond identifies the region within R ≤ 0.5 r200. 1σ error bars are shown. The dashed line represents the expected value at the cluster mean z, using the relation of Bai et al. (2009) between ΣSFR/mass and z, and the richness/mass value of the A1763 virial (R ≤ r200) region (see Sect. 3.4).
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