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Fig. 8

image

LBC colour image of 2XMMp J092120.2+371735, the high-redshift group at z ~ 1.21. We assigned r-SLOAN and z-SLOAN images from the LBC to the blue and red channel of the colour image. The green channel was created from the mean of both bands. Overplotted red squares refer to the z ~ 1.2 group, and green circles show spectroscopic sources outside our membership criteria, while blue cycles indicate galaxies of a foreground population (see Sect. 6.5.1). North is up, east is left, and the image is centred on the X-ray position.

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