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We present strong evidence for the existence of a supercluster at a redshiftof z=0.54 in the direction of Selected Area 68. From the distribution ofgalaxies with spectroscopic redshifts we find that there is a largeover-density of galaxies (a factor of four over the number expected in anunclustered universe) within the redshift range 0.530 < z < 0.555. Byconsidering the spatial distribution of galaxies within this redshift range(using spectroscopic and photometric redshifts) we show that the galaxies inSA68 form a linear structure passing from the South-West of the survey fieldthrough to the North-East (with a position angle of approximately 35 deg Eastof North). This position angle is coincident with the positions of the X-rayclusters CL0016+16, RX J0018.3+1618 and a new X-ray cluster, RX J0018.8+1602,centered near the radio source 54W084. All three of these sources are at aredshift of approximately z=0.54 and have position angles, derived from theirX-ray photon distributions, consistent with that measured for the supercluster.Assuming a redshift of 0.54 for the distribution of galaxies and a FWHMdispersion in redshift of 0.020 this represents a coherent structure with aradial extent of 31 Mpc, transverse dimension of 12 Mpc, and a thickness ofapproximately 4 Mpc. The detection of this possible supercluster demonstratesthe power of using X-ray observations, combined with multicolor observations,to map the large scale distribution of galaxies at intermediate redshifts.

Superclustering at Redshift [CLC][ITAL]z[/ITAL] = 0.54[/CLC]