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We present the first discovery of dust-reddened quasars (red quasars) in thehigh-z universe (z >5.6). This is a result from the Subaru High-z Explorationof Low-Luminosity Quasars (SHELLQs) project, which is based on the sensitivemulti-band optical imaging data produced by the Hyper Suprime-Cam (HSC) SubaruStrategic Program survey. We identified four red quasar candidates from thespectroscopically confirmed 93 high-z quasars in the SHELLQs sample, based ondetections in the Wide-field Infrared Survey Explorer (WISE) data at 3.4 and4.6 um (rest-frame ~5000-6500 A). The amount of dust reddening was estimatedwith spectral energy distribution (SED) fits over optical and mid-infraredwavelengths. Two of the four candidates were found to be red quasars with dustreddening of E(B-V) > 0.1. The remaining SHELLQs quasars without individualWISE detections are significantly fainter in the WISE bands and bluer than thered quasars, although we did detect them in the W1 band in a stacked image. Wealso conducted the same SED fits for high-z optically-luminous quasars, but nored quasar was found. This demonstrates the power of Subaru HSC to discoverhigh-z red quasars, which are fainter than the limiting magnitudes of pastsurveys in the rest-frame ultraviolet, due to dust extinction.

Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). IX. Identification of Two Red Quasars at z > 5.6