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We report a discovery of a proto-cluster in vigorous assembly and hostingstrong star forming activities, associated to a radio galaxy USS 1558-003 atz=2.53, as traced by a wide-field narrow-band H_alpha imaging with MOIRCS onSubaru Telescope. We find 68 H_alpha emitters with dust-uncorrected SFRs downto 8.6 Msun/yr. Their spatial distribution indicates that there are threeprominent clumps of H_alpha emitters, one surrounding the radio galaxy andanother located at ~1.5 Mpc away to the south-west, and the other located inbetween the two. These contiguous three systems are very likely to mergetogether in the near future and may grow to a single more massive cluster atlater times. Whilst most H_alpha emitters reside in the "blue cloud" on thecolor--magnitude diagram, some emitters have very red colors withJ-Ks>1.38(AB). Interestingly, such red H_alpha emitters are located towards thefaint end of the red sequence, and they tend to be located in the high densityclumps. We do not see any statistically significant difference in thedistributions of individual star formation rates or stellar masses of theH_alpha emitters between the dense clumps and the other regions, suggestingthat this is one of the notable sites where the progenitors of massive galaxiesin the present-day clusters were in their vigorous formation phase. Finally, wefind that H_alpha emission of the radio galaxy is fairly extended spatiallyover ~4.5 arcsec. However it is not as widespread as its Lya halo, meaning thatthe Lya emission is indeed severely extended by resonant scattering.

A star-bursting proto-cluster in making associated to a radio galaxy at z=2.53 discovered by H_alpha imaging