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

T. Hamana; M. Shirasaki; S. Miyazaki; C. Hikage; M. Oguri; S. More; R. Armstrong; A. Leauthaud; R. Mandelbaum; H. Miyatake; A. J. Nishizawa; M. Simet; M. Takada; H. Aihara; J. Bosch; Y. Komiyama; R. Lupton; H. Murayama; M. A. Strauss; M. Tanaka

doi:10.1093/pasj/psz138

paper

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

arXiv:1906.06041 · doi:10.1093/pasj/psz138

Abstract

We present measurements of cosmic shear two-point correlation functions (TPCFs) from Hyper Suprime-Cam Subaru Strategic Program (HSC SSP) first-year data, and derived cosmological constraints based on a blind analysis. The HSC first-year shape catalog is divided into four tomographic redshift bins ranging from $z = 0.3$ to 1.5 with equal widths of $Δ z = 0.3$ . The unweighted galaxy number densities in each tomographic bin are 5.9, 5.9, 4.3, and 2.4 arcmin $^{- 2}$ from lower to higher redshifts, respectively. We adopt the standard TPCF estimators, $ξ_{\pm}$ , for our cosmological analysis, given that we find no evidence of the significant B-mode shear. The TPCFs are detected at high significance for all ten combinations of auto- and cross-tomographic bins over a wide angular range, yielding a total signal-to-noise ratio of 19 in the angular ranges adopted in the cosmological analysis, $7^{'} < θ < 5 6^{'}$ for $ξ_{+}$ and $2 8^{'} < θ < 17 8^{'}$ for $ξ_{-}$ . We perform the standard Bayesian likelihood analysis for cosmological inference from the measured cosmic shear TPCFs, including contributions from intrinsic alignment of galaxies as well as systematic effects from PSF model errors, shear calibration uncertainty, and source redshift distribution errors. We adopt a covariance matrix derived from realistic mock catalogs constructed from full-sky gravitational lensing simulations that fully account for survey geometry and measurement noise. For a flat $Λ$ cold dark matter model, we find $S_{8} \equiv σ_{8} Ω_{m} /0.3 = 0.82 3_{- 0.028}^{+ 0.032}$ , and $Ω_{m} = 0.33 2_{- 0.096}^{+ 0.050}$ . We carefully check the robustness of the cosmological results against astrophysical modeling uncertainties and systematic uncertainties in measurements, and find that none of them has a significant impact on the cosmological constraints.

Replaced with the bug-fixed version. The results presented in the original publication were found to be affected by bugs in the software used for the numerical computation. The erratum will be published in PASJ. In this version, revised results obtained from corrected computations are presented. Revised chains are available from http://th.nao.ac.jp/MEMBER/hamanatk/HSC16aCSTPCFbugfix/index.html

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

Abstract

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