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We measure cosmic weak lensing shear power spectra with the Subaru HyperSuprime-Cam (HSC) survey first-year shear catalog covering 137deg$^2$ of thesky. Thanks to the high effective galaxy number density of $\sim$17arcmin$^{-2}$ even after conservative cuts such as magnitude cut of $i<24.5$and photometric redshift cut of $0.3\leq z \leq 1.5$, we obtain a highsignificance measurement of the cosmic shear power spectra in 4 tomographicredshift bins, achieving a total signal-to-noise ratio of 16 in the multipolerange $300 \leq \ell \leq 1900$. We carefully account for various uncertaintiesin our analysis including the intrinsic alignment of galaxies, scatters andbiases in photometric redshifts, residual uncertainties in the shearmeasurement, and modeling of the matter power spectrum. The accuracy of ourpower spectrum measurement method as well as our analytic model of thecovariance matrix are tested against realistic mock shear catalogs. For a flat$\Lambda$ cold dark matter ($\Lambda$CDM) model, we find $S_8\equiv\sigma_8(\Omega_{\rm m}/0.3)^\alpha=0.800^{+0.029}_{-0.028}$ for $\alpha=0.45$($S_8=0.780^{+0.030}_{-0.033}$ for $\alpha=0.5$) from our HSC tomographiccosmic shear analysis alone. In comparison with Planck cosmic microwavebackground constraints, our results prefer slightly lower values of $S_8$,although metrics such as the Bayesian evidence ratio test do not showsignificant evidence for discordance between these results. We study the effectof possible additional systematic errors that are unaccounted in our fiducialcosmic shear analysis, and find that they can shift the best-fit values of$S_8$ by up to $\sim 0.6\sigma$ in both directions. The full HSC survey datawill contain several times more area, and will lead to significantly improvedcosmological constraints.

Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data