Colour-detected clusters in the XMM Large Scale Structure Survey
  We present first results on the use of a colour space filter for detecting galaxy clusters at cosmological redshifts in the XMM Large Scale Structure Survey. All clusters studied, but one, are successfully colour--detected in spite of their large redshift (0.3<z<1.0), X-ray selection and intrinsic low richness (R=0 or below). We experimentally show that the cluster redshift can be derived, with good accuracy, from the colour of the red sequence, at 0.06<z<1 using a sample of about 160 clusters. 
S. Andreon, J. Willis, H. Quintana, I. Valtchanov, M. Pierre, F.   Pacaud