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Finding a sample of the most massive clusters with redshifts $z>0.6$ canprovide an interesting consistency check of the $\Lambda$ cold dark matter($\Lambda$CDM) model. Here we present results from our search for clusters with$0.6\lesssim z\lesssim1.0$ where the initial candidates were selected bycross-correlating the RASS faint and bright source catalogues with red galaxiesfrom the Sloan Digital Sky Survey DR8. Our survey thus covers$\approx10,000\,\rm{deg^2}$, much larger than previous studies of this kind.Deeper follow-up observations in three bands using the William HerschelTelescope and the Large Binocular Telescope were performed to confirm thecandidates, resulting in a sample of 44 clusters for which we presentrichnesses and red sequence redshifts, as well as spectroscopic redshifts for asubset. At least two of the clusters in our sample are comparable in richnessto RCS2-$J$232727.7$-$020437, one of the richest systems discovered to date. Wealso obtained new observations with the Combined Array for Research inMillimeter Astronomy for a subsample of 21 clusters. For 11 of those we detectthe Sunyaev-Zel'dovich effect signature. The Sunyaev-Zel'dovich signal allowsus to estimate $M_{200}$ and check for tension with the cosmological standardmodel. We find no tension between our cluster masses and the $\Lambda$CDMmodel.

Optical & Sunyaev-Zel'dovich Observations of a New Sample of Distant Rich Galaxy Clusters in the ROSAT All Sky Survey