SSA22-LAB1/LAB2 are giant, prototypical Lyα blobs located in the z=3.1 SSA22 proto-cluster and considered to be a part of much more extended cosmic web filaments. Recent ALMA surveys have brought unprecedented views: cold dust and gas are widely distributed across the LABs. The (often extended) ISM emission is found to be associated with ongoing multiple-merger events, also identifying several ‘previously missed’ galaxies. Therefore such giant LABs provide a unique laboratory to understand the assembly of gas-rich, growing galaxies in the cosmic web in the early Universe. However, the current depth of a Ks-band image, which enables us to catch the rest-frame Optical emission from the ground, is not sufficient and stellar mass distributions in the LABs have not yet fully uncovered. To this end, we propose very deep Ks-band imaging of the LABs using Subaru/MOIRCS. Our goals are : (i) to perform the most sensitive census of stellar mass distribution within the giant Lyα blobs ever, and to uncover how the specific environment affect the galaxy formation, (ii) to investigate the origin of the widely distributed ISMs, and (iii) to test a formation scenario of BCG-like galaxies in a forming phase at z=3.
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