Kavli Affiliate: Masahiro Takada
| First 5 Authors: Hironao Miyatake, Sunao Sugiyama, Masahiro Takada, Takahiro Nishimichi, Masato Shirasaki
| Summary:
We present high-fidelity cosmology results from a blinded joint analysis of
galaxy-galaxy weak lensing ($Delta!Sigma$) and projected galaxy clustering
($w_{rm p}$) measured from the Hyper Suprime-Cam Year-1 (HSC-Y1) data and
spectroscopic Sloan Digital Sky Survey (SDSS) galaxy catalogs in the redshift
range $0.15<z<0.7$. We define luminosity-limited samples of SDSS galaxies to
serve as the tracers of $w_{rm p}$ in three spectroscopic redshift bins, and
as the lens samples for $Delta!Sigma$. For the $Delta!Sigma$
measurements, we select a single sample of 4 million source galaxies over 140
deg$^2$ from HSC-Y1 with photometric redshifts (photo-$z$) greater than 0.75,
enabling a better handle of photo-$z$ errors by comparing the $Delta!Sigma$
amplitudes for the three lens redshift bins. For cosmological parameter
inference, we use an input galaxy-halo connection model built on the {tt Dark
Emulator} package with a halo occupation distribution that includes nuisance
parameters to marginalize over modeling uncertainties. We model the
$Delta!Sigma$ and $w_{rm p}$ measurements on scales from $Rsimeq 3$ and
$2,h^{-1}{rm Mpc}$, respectively, up to $30,h^{-1}{rm Mpc}$ assuming a flat
$Lambda$CDM cosmology. With various tests using mock catalogs described in
Miyatake et al. (2021), we show that any bias in the clustering amplitude
$S_8equiv sigma_8(Omega_{rm m}/0.3)^{0.5}$ due to uncertainties in the
galaxy-halo connection is less than $sim50$% of the statistical uncertainty
of $S_8$, {it unless} the assembly bias effect is unexpectedly large. Our
best-fit models have $S_8=0.795^{+0.049}_{-0.042}$ (mode and 68% credible
interval) for the flat $Lambda$CDM model; we find tighter constraints on the
quantity $S_8(alpha=0.17)equivsigma_8(Omega_{rm m}/0.3)^{0.17}
=0.745^{+0.039}_{-0.031}$. (abriged)
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