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We conduct a search for galaxy-scale strong gravitational lens systems inData Release 4 of the Hyper Suprime-Cam Subaru Strategic Program (HSC SSP),consisting of data taken up to the S21A semester. We select 103191 luminous redgalaxies from the Baryon Oscillation Spectroscopic Survey (BOSS) sample thathave deep multiband imaging from the HSC SSP and use the YattaLens algorithm toautomatically identify lens candidates with blue arc-like features. Thecandidates are visually inspected and graded based on their likelihood of beinga lens. We find 8 definite lenses, 28 probable lenses, and 138 possible lenses.The new lens candidates generally have lens redshifts in the range $0.3\lesssim z_{\mathrm{L}} \lesssim 0.9$, a key intermediate redshift range tostudy the evolution of galaxy structure. Follow-up spectroscopy will confirmthese new lenses and measure source redshifts to enable detailed lens modeling.

Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). VIII. New galaxy-scale lenses from the HSC SSP