Fig. 8

PSZ1 G118.06+31.10, a galaxy cluster classified as fossil group following the definition of Voevodkin et al. (2010). Top: WFC/INT r′ band image of the cluster. The Planck pointing is shown with a small green circle, and the large circle has 5′ diameter. The BCG is also highlighted. Bottom: colour−magnitude diagram of the galaxies near the cluster centre. The squares indicate the spectroscopically confirmed members within 0.5 Mpc distance from the BCG.
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