TY - JOUR

T1 - Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data

AU - Hamana, Takashi

AU - Shirasaki, Masato

AU - Miyazaki, Satoshi

AU - Hikage, Chiaki

AU - Oguri, Masamune

AU - More, Surhud

AU - Armstrong, Robert

AU - Leauthaud, Alexie

AU - Mandelbaum, Rachel

AU - Miyatake, Hironao

AU - Nishizawa, Atsushi J.

AU - Simet, Melanie

AU - Takada, Masahiro

AU - Aihara, Hiroaki

AU - Bosch, James

AU - Komiyama, Yutaka

AU - Lupton, Robert

AU - Murayama, Hitoshi

AU - Strauss, Michael A.

AU - Tanaka, Masayuki

N1 - Publisher Copyright:
© 2020 The Author(s) 2019. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. For permissions, please e-mail: journals.permissions@oup.com.

PY - 2020/2/1

Y1 - 2020/2/1

N2 - We present measurements of cosmic shear two-point correlation functions (TPCFs) from Hyper Suprime-Cam Subaru Strategic Program (HSC) first-year data, and derive 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 2.4-2 from the lowest to highest redshifts, respectively. We adopt the standard TPCF estimators, ξ ±, for our cosmological analysis, given that we find no evidence of significant B-mode shear. The TPCFs are detected at high significance for all 10 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 <56' for ξ + and 28'<θ <178' 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 {equation presented}. 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.

AB - We present measurements of cosmic shear two-point correlation functions (TPCFs) from Hyper Suprime-Cam Subaru Strategic Program (HSC) first-year data, and derive 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 2.4-2 from the lowest to highest redshifts, respectively. We adopt the standard TPCF estimators, ξ ±, for our cosmological analysis, given that we find no evidence of significant B-mode shear. The TPCFs are detected at high significance for all 10 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 <56' for ξ + and 28'<θ <178' 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 {equation presented}. 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.

KW - cosmological parameters

KW - cosmology: observations

KW - dark matter

KW - large-scale structure of universe

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U2 - 10.1093/pasj/psz138

DO - 10.1093/pasj/psz138

M3 - Article

AN - SCOPUS:85082554733

SN - 0004-6264

VL - 72

JO - Publications of the Astronomical Society of Japan

JF - Publications of the Astronomical Society of Japan

IS - 1

M1 - 16

ER -