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We report the discovery of a large-scale structure of Lyman alpha emitters(LAEs) at z=4.86 based on wide-field imaging with the prime-focus camera(Suprime-Cam) on the Subaru telescope. We observed a 25' x 45' area of theSubaru Deep Field in a narrow band (NB, lambdaC=7126 A and FWHM=73 A) togetherwith R and i'. We isolate from these data 43 LAE candidates down to NB=25.5 magusing color criteria. Follow-up spectroscopy of five candidates suggests thecontamination by low-z objects to be ~ 20%. We find that the LAE candidates areclustered in an elongated region on the sky of 20 Mpc in width and 50 Mpc inlength at z=4.86, which is comparable in size to present-day large-scalestructures (we adopt H0=70 km/s/Mpc, Omega0=0.3, lambda0=0.7). This elongatedregion includes a circular region of 12 Mpc radius of higher surfaceoverdensity (delta=2), which may be the progenitor of a cluster of galaxies.Assuming this circular region to be a sphere with a spatial overdensity of 2,we compare our observation with predictions by Cold Dark Matter models. We findthat an Omega0=0.3 flat model with sigma8=0.9 predicts the number of suchspheres consistent with the observed number (one sphere in our survey volume)if the bias parameter of LAEs is b \simeq 6. This value suggests that thetypical mass of dark haloes hosting LAEs at z \simeq 5 is of the order of 10^12Msolar. Such a large mass poses an interesting question about the nature ofLAEs.Comment: 4 pages, 4 figures, uses emulateapj5.sty, ApJL, accepte

Subaru Deep Survey. IV. Discovery of a Large-Scale Structure at Redshift ≃5