We propose to conduct a systematic HSC imaging survey of seven nearby bright late-type galaxies with about 15 nights. Our recent HSC studies demonstrated that we could resolve stellar contents of outer structures of nearby galaxies (≤7Mpc) and derive their stellar populations with a reasonable observing time. We wish to extend our studies to the systematic and homogeneous survey. With the contiguous pointings covering R>0.5Rvir of galaxies, our primary goals will be to [1] determine the true nature of stellar contents in the large-scale structures, [2] derive age and metallicity constraints for the extended component, [3] search for new satellites, streams, stellar debris and [4] search for globular clusters. We carefully choose disk galaxies brighter than MB=−18 that are located beyond the Local Group and within 5 Mpc. They have a wide range of stellar mass, morphological type and inclination, which allow us to verify statistically stellar halo and thick disk existence, their stellar populations, and its dependence on the other properties. HSC is the only instrument and the proposed plan is the only viable way that enables us to do this study with moderate observing time. Moreover, the requested data will remain the best ground-based images even compared with LSST 10-year coadded data.
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