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We report discovery of 41 new high-z quasars and luminous galaxies, whichwere spectroscopically identified at 5.7 < z < 6.9. This is the fourth in aseries of papers from the Subaru High-z Exploration of Low-Luminosity Quasars(SHELLQs) project, based on the deep multi-band imaging data collected by theHyper Suprime-Cam (HSC) Subaru Strategic Program survey. We selected thephotometric candidates by a Bayesian probabilistic algorithm, and then carriedout follow-up spectroscopy with the Gran Telescopio Canarias and the SubaruTelescope. Combined with the sample presented in the previous papers, we havenow spectroscopically identified 137 extremely-red HSC sources over about 650deg2, which include 64 high-z quasars, 24 high-z luminous galaxies, 6 [O III]emitters at z ~ 0.8, and 43 Galactic cool dwarfs (low-mass stars and browndwarfs). The new quasars span the luminosity range from M1450 ~ -26 to -22 mag,and continue to populate a few magnitude lower luminosities than have beenprobed by previous wide-field surveys. In a companion paper, we derive thequasar luminosity function at z ~ 6 over an unprecedentedly wide range of M1450~ -28 to -21 mag, exploiting the SHELLQs and other survey outcomes.

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 < z < 6.9