期刊
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
卷 72, 期 1, 页码 -出版社
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psz138
关键词
cosmological parameters; cosmology: observations; dark matter; large-scale structure of universe
资金
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- JSPS KAKENHI [JP15H05887, JP15H05892, JP15H05893, 17H06600, JP17K05457, 18H04350, 18H04358, JP18K03693]
- National Aeronautics and Space Administration
- Department of Energy Cosmic Frontier program [DE-SC0010118]
- Hyper Suprime-Cam (HSC) collaboration includes the astronomical communities of Japan
- Princeton University
- Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU)
- University of Tokyo
- High Energy Accelerator Research Organization (KEK)
- FIRST program from Japanese Cabinet Office
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS), Japan Science and Technology Agency (JST)
- Toray Science Foundation
- Max-Planck Society
- Max Planck Institute for Extraterrestrial Physics
- National Central University of Taiwan [NNX08AR22G]
- NASA Science Mission Directorate
- National Science Foundation [AST-1238877]
- University of Maryland, and Eotvos Lorand University (ELTE)
- Los Alamos National Laboratory
- Grants-in-Aid for Scientific Research [18H04358, 18H04350, 17H06600] Funding Source: KAKEN
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 Delta 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 the lowestto highest redshifts, respectively. We adopt the standard TPCF estimators, xi(+/-) 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-tonoise ratio of 19 in the angular ranges adopted in the cosmological analysis, 7' < theta < 56' for xi(+) and 28' < theta < 178' for xi(-). 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 Lambda cold dark matter model, we find S-8 (math) sigma(8)root Omega(m)/0.3 = 0.8041(-0.029)(+0.032) and Omega(m) = 0.346(-0.100)(+0.052). 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.
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