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Recently, we conducted a Very Large Telescope (VLT) large program to searchfor forming clusters by looking for overdensities of Ly-alpha emitters aroundhigh redshift radio galaxies. In total seven proto-clusters were discovered,including a proto-cluster around the radio galaxy MRC 0316--257 at z ~ 3.13.This structure has an excess of Ly-alpha emitters by a factor of 3 as comparedto the field, and the derived mass is 2-5 x 10^14 M_sun. The Ly-alpha emittersin the proto-cluster are on average bluer than Lyman Break Galaxies (LBGs).Also, the galaxies are faint (sub L_*) and small (half light radii < 1.7 kpc,which is smaller than the average size of LBGs). This might indicate that, atleast a fraction of, Ly-alpha emitters could be young (~ 10^6 yr), nearlydust-free, forming galaxies.Comment: 6 pages, 2 figures. To appear in the proceedings of the Venice  conference "Multiwavelength Mapping of Galaxy Formation and Evolution",  October 13-16, 200

A Study of Distant Lyα Emitters in Overdense Regions