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We report a discovery of $z = 4.72$ radio galaxy, HSC J083913.17+011308.1, byusing the Lyman break technique with the Hyper Suprime-Cam Subaru StrategicSurvey (HSC-SSP) catalog for VLA FIRST radio sources. The number of knownhigh-$z$ radio galaxies (HzRGs) at $z > 3$ is quite small to constrain theevolution of HzRGs so far. The deep and wide-area optical survey by HSC-SSPenables us to apply the Lyman break technique to a large search for HzRGs. Foran HzRG candidate among pre-selected $r$-band dropouts with a radio detection,a follow-up optical spectroscopy with GMOS/Gemini has been performed. Theobtained spectrum presents a clear Ly$\alpha$ emission line redshifted to$z=4.72$. The SED fitting analysis with the rest-frame UV and opticalphotometries suggests the massive nature of this HzRG with $\log{M_*/M_{\odot}}= 11.4$. The small equivalent width of Ly$\alpha$ and the moderately red UVcolors indicate its dusty host galaxy, implying a chemically evolved and dustysystem. The radio spectral index does not meet a criterion for an ultra-steepspectrum: $\alpha^{325}_{1400}$ of $-1.1$ and $\alpha^{150}_{1400}$ of $-0.9$,demonstrating that the HSC-SSP survey compensates for a sub-population of HzRGswhich are missed in surveys focusing on an ultra-steep spectral index.

Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). III. Discovery of a z = 4.72 Radio Galaxy with Lyman Break Technique