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We present three candidate clusters of galaxies at redshifts most likelybetween 1.7 and 2.0, which corresponds to a fundamentally unexplored epoch ofclusters evolution. The candidates were found by studying the environmentaround our newly selected sample of "beacons" low-luminosity (FRI) radiogalaxies in the COSMOS field. In this way we intend to use the fact that FRI atlow z are almost invariably located in clusters of galaxies. We use the mostaccurate photometric redshifts available to date, derived by the COSMOScollaboration using photometry with a set of 30 filters, to look forthree-dimensional space over-densities around our objects. Three out of thefive FRIs in our sample which possess reliable photometric redshifts betweenz_phot = 1.7 and 2.0 display overdensities that together are statisticallysignificant at the 4-sigma level, compared to field counts, arguing for thepresence of rich clusters of galaxies in their Mpc environment. These firstresults show that the new method for finding high-z clusters we recentlyproposed, which makes use of low power FRI radio galaxies instead of the morepowerful FRII sources often used in the literature to date, is returning verypromising candidates.

Three candidate clusters of galaxies at redshift ~1.8: the "missing link" between protoclusters and local clusters?