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We present measurements of cosmic shear two-point correlation functions(TPCFs) from Hyper Suprime-Cam Subaru Strategic Program (HSC SSP) first-yeardata, and derived cosmological constraints based on a blind analysis. The HSCfirst-year shape catalog is divided into four tomographic redshift bins rangingfrom $z=0.3$ to 1.5 with equal widths of $\Delta z =0.3$. The unweighted galaxynumber densities in each tomographic bin are 5.9, 5.9, 4.3, and 2.4arcmin$^{-2}$ from lower to higher redshifts, respectively. We adopt thestandard TPCF estimators, $\xi_\pm$, for our cosmological analysis, given thatwe find no evidence of the significant B-mode shear. The TPCFs are detected athigh significance for all ten combinations of auto- and cross-tomographic binsover a wide angular range, yielding a total signal-to-noise ratio of 19 in theangular ranges adopted in the cosmological analysis, $7'<\theta<56'$ for$\xi_+$ and $28'<\theta<178'$ for $\xi_-$. We perform the standard Bayesianlikelihood analysis for cosmological inference from the measured cosmic shearTPCFs, including contributions from intrinsic alignment of galaxies as well assystematic effects from PSF model errors, shear calibration uncertainty, andsource redshift distribution errors. We adopt a covariance matrix derived fromrealistic mock catalogs constructed from full-sky gravitational lensingsimulations that fully account for survey geometry and measurement noise. For aflat $\Lambda$ cold dark matter model, we find $S_8 \equiv\sigma_8\sqrt{\Omega_m/0.3}=0.823_{-0.028}^{+0.032}$, and$\Omega_m=0.332_{-0.096}^{+0.050}$. We carefully check the robustness of thecosmological results against astrophysical modeling uncertainties andsystematic uncertainties in measurements, and find that none of them has asignificant impact on the cosmological constraints.

Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data