arcsec 2 in isophotal area and brighter than 0.7× 10-16 ergs s-1 cm-2, located in and around
the protocluster region at redshift z= 3.1 discovered by Steidel et al. in the SSA22 field,
based on wide-field (31'× 23') and deep narrowband (NB497; 4977 Å, FWHM 77 Å) and
broadband (B, V, and R) images taken with the prime-focus camera on the Subaru
Telescope. The two previously known giant LABs are the most luminous and the largest in …