Hyper SuprimeCam Year 3 results: Cosmology from galaxy clustering and weak lensing with HSC and SDSS using the emulator based halo model
Abstract
We present cosmology results from a blinded joint analysis of cosmic shear, ξ_{±}(ϑ ), galaxygalaxy weak lensing, Δ Σ (R ), and projected galaxy clustering, w_{p}(R ), measured from the Hyper SuprimeCam threeyear (HSCY3) shape catalog and the Sloan Digital Sky Survey (SDSS) DR11 spectroscopic galaxy catalog—a 3 ×2 pt cosmology analysis. We define luminositycut, and therefore nearly volumelimited, samples of SDSS galaxies to serve as the tracers of w_{p} and as the lens samples for Δ Σ in three spectroscopic redshift bins spanning the range 0.15 <z <0.7 . For the ξ_{±} and Δ Σ measurements, we use a single sample of about seven million source galaxies over 416 deg^{2} , selected from HSCY3 based on having photometric redshifts (photoz ) greater than 0.75. The deep, highquality HSCY3 data enable significant detections of the Δ Σ signals, with integrated signaltonoise ratio S /N ∼24 in the range 3 ≤R /[h^{1} Mpc ]≤30 over the three lens samples. ξ_{±} has S /N ∼19 in the range 8^{'}≤ϑ ≤5 0^{'} and 30^{'}≤ϑ ≤15 0^{'} for ξ_{+} and ξ_{}, respectively. For cosmological parameter inference, we use the Dark Emulator package, combined with a halo occupation distribution prescription for the relation between galaxies and halos, to model w_{p} and Δ Σ down to quasinonlinear scales, and we estimate cosmological parameters after marginalizing over nuisance parameters. In our baseline analysis we employ an uninformative flat prior of the residual photoz error, given by Π (Δ z_{ph})=U (1 ,1 ) , to model a residual bias in the mean redshift of HSC source galaxies. Comparing the relative lensing amplitudes for Δ Σ in the three redshift bins and for ξ_{±} with the single HSC source galaxy sample allows us to calibrate the photoz parameter Δ z_{ph} to the precision of σ (Δ z_{ph})≃0.09 . With these methods, we obtain a robust constraint on the cosmological parameters for the flat Λ CDM model: S_{8}=σ_{8}(Ω_{m}/0.3 )^{0.5}=0.763_{0.036}^{+0.040} , or the bestconstrained parameter given by S_{8}^{'}=σ_{8}(Ω_{m}/0.3 )^{0.22}=0.721 ±0.028 , determined with about 4% fractional precision. Based on multidimensional tension metrics, HSCY3 data exhibits about 2.5 σ tension with the cosmological constraint inferred by Planck for the Λ CDM model, and hints at a nonzero residual photoz bias implying that the true mean redshift of the HSC galaxies at z ≳0.75 is higher than that implied by the original photoz estimates.
 Publication:

Physical Review D
 Pub Date:
 December 2023
 DOI:
 10.1103/PhysRevD.108.123517
 arXiv:
 arXiv:2304.00704
 Bibcode:
 2023PhRvD.108l3517M
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 39 pages, 25 figures, 5 tables, for coordinated submission to PRD with other HSC Y3 weak lensing cosmology papers  see https://hscrelease.mtk.nao.ac.jp/doc/index.php/wly3/. arXiv admin note: text overlap with arXiv:2111.02419