The Spiderweb protocluster is known as one of the most evolved systems at z∼2, which contains many massive red galaxies. We now aim to understand how the environment is affecting the internal star formation activities and bulge formation in protoclusters with AO-assisted narrow-band Hα and K-band imaging with IRCS with a ∼ 0.2′′ resolution. We will test if the star-forming galaxies in this extreme environment are accompanied by dusty, compact star formation, or their star formation is extended over the disk by measuring the sSFR of inner ∼kpc galaxy cores, outer disks, and star-forming clumps. We will also compare the obtained Hα image with existing spatially-resolved JWST, HST, and ALMA images to investigate the dust and molecular gas distribution. We will focus on compact star-forming galaxies, which are suggested to exist only in protoclusters by seeing-limited imaging. We aim to confirm them and address their physical origin. We will also focus on dusty clumps in massive galaxies, which may be the site of bulge formation as a result of migration and mergers of star-forming clumps. The proposed unique AO+NB imaging will shed light on the environmental impacts on the internal structures of galaxies in making at the cosmic noon.
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