HIGH-REDSHIFT CLUSTERING TAGGED BY LUMINOUS RADIO GALAXIES

Giant radio galaxies at high redshift tag clusters which have already developedsignificant atmospheres but which should be typical of their redshift. XMM.slarge throughput provides an unprecedented opportunity for spectral measurementsof such clusters. We propose to observe 5 highredshift radio galaxies selectedin an unbiased way from the complete 3CRR radio catalogue. The Xrayluminosities and temperatures, together with the level of subclustering in thefields, will be used to probe cosmological models. The results, in conjunctionwith our groundbased studies of star formation in the galaxies and total massestimates of the systems, will determine the extent to which the clusters aredynamically young. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]