Hyper Suprime-Cam Year 3 Results: Cosmology from Galaxy Clustering and Weak Lensing with HSC and SDSS using the Emulator Based Halo Model

• Main Authors: Miyatake, Hironao, Sugiyama, Sunao, Takada, Masahiro, Nishimichi, Takahiro, Li, Xiangchong, Shirasaki, Masato, More, Surhud, Kobayashi, Yosuke, Nishizawa, Atsushi J, Rau, Markus M, Zhang, Tianqing, Takahashi, Ryuichi, Dalal, Roohi, Mandelbaum, Rachel, Strauss, Michael A, Hamana, Takashi, Oguri, Masamune, Osato, Ken, Luo, Wentao, Kannawadi, Arun, Hsieh, Bau-Ching, Armstrong, Robert, Komiyama, Yutaka, Lupton, Robert H, Lust, Nate B, MacArthur, Lauren A, Miyazaki, Satoshi, Murayama, Hitoshi, Okura, Yuki, Price, Paul A, Sunayama, Tomomi, Tait, Philip J, Tanaka, Masayuki, Wang, Shiang-Yu
• Format: Journal Article
• Language: English
• Published: 02.04.2023
• Subjects: Physics - Cosmology and Nongalactic Astrophysics
• DOI: 10.48550/arxiv.2304.00704

We present cosmology results from a blinded joint analysis of cosmic shear, $\xi_{\pm}(\vartheta)$, galaxy-galaxy weak lensing, $\Delta\!\Sigma(R)$, and projected galaxy clustering, $w_{\rm p}(R)$, measured from the Hyper Suprime-Cam three-year (HSC-Y3) shape catalog and the Sloan Digital Sky Survey (SDSS) DR11 spectroscopic galaxy catalog - a 3$\times$2pt cosmology analysis. We define luminosity-cut samples of SDSS galaxies to serve as the tracers of $w_{\rm p}$ and as the lens samples for $\Delta\!\Sigma$ in three spectroscopic redshift bins spanning the range $0.15<z<0.7$. For the $\xi_{\pm}$ and $\Delta\!\Sigma$ measurements, we use a single source sample over 416 deg$^2$, selected from HSC-Y3 based on having photometric redshifts (photo-$z$) greater than 0.75. For cosmological parameter inference, we use Dark Emulator combined with a halo occupation distribution prescription to model $w_{\rm p}$ and $\Delta\!\Sigma$ down to quasi-nonlinear scales. In our baseline analysis we employ an uninformative flat prior of the residual photo-$z$ error to model a residual bias in the mean redshift of HSC source galaxies. We obtain a robust constraint on the cosmological parameters for the flat $\Lambda$CDM model: $S_8=\sigma_8(\Omega_{\rm m}/0.3)^{0.5}=0.763^{+0.040}_{-0.036}$ (68% C.I.), or the best-constrained parameter given by $S'_8=\sigma_8(\Omega_{\rm m}/0.3)^{0.22}=0.721\pm 0.028$, determined with about 4% fractional precision. Our HSC-Y3 data exhibits about 2.5$\sigma$ tension with the Planck inferred $S_8$ value for the $\Lambda$CDM model, and hints at a non-zero residual photo-$z$ bias implying that the true mean redshift of the HSC galaxies at $z\gtrsim 0.75$ is higher than that implied by the original photo-$z$ estimates.