Hyper SuprimeCam Year 3 results: Cosmology from galaxy clustering and weak lensing with HSC and SDSS using the minimal bias model
Abstract
We present cosmological parameter constraints from a blind joint analysis of three twopoint correlation functions measured from the Year 3 Hyper SuprimeCam (HSCY3) imaging data, covering about 416 deg^{2} , and the SDSS DR11 spectroscopic galaxies spanning the redshift range [0.15, 0.70]. We subdivide the SDSS galaxies into three luminositycut, and therefore nearly volumelimited samples separated in redshift, each of which acts as a largescale structure tracer characterized by the measurement of the projected correlation function, w_{p}(R ). We also use the measurements of the galaxygalaxy weaklensing signal Δ Σ (R ) for each of these SDSS samples which act as lenses for a secure sample of source galaxies selected from the HSCY3 shape catalog based on their photometric redshifts. We combine these measurements with the cosmic shear correlation functions, ξ_{±}(ϑ ) measured for our HSC source sample. We model these observables with the minimal bias model of the galaxy clustering observables in the context of a flat Λ CDM cosmology. We use conservative scale cuts, R >12 and 8 h^{1} Mpc for Δ Σ and w_{p}, respectively, where the minimal bias model is valid, in addition to conservative prior on the residual bias in the mean redshift of the HSC photometric source galaxies. We present various validation tests of our model as well as analysis methods. Our baseline analysis yields S_{8}=0.77 5_{0.038}^{+0.043} (68% C.I.) for the Λ CDM model, after marginalizing over uncertainties in other parameters. Our value of S_{8} is consistent with that from the Planck 2018 data, but the credible interval of our result is still relatively large. We show that various internal consistency tests based on different splits of the data are passed. Our results are statistically consistent with those of a companion paper, which extends this analysis to smaller scales with an emulatorbased halo model, using Δ Σ (R ) and w_{p}(R ) down to R >3 and 2 h^{1} Mpc , respectively.
 Publication:

Physical Review D
 Pub Date:
 December 2023
 DOI:
 10.1103/PhysRevD.108.123521
 arXiv:
 arXiv:2304.00705
 Bibcode:
 2023PhRvD.108l3521S
 Keywords:

 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 29 pages, 17 figures, 4 tables, version accepted for publication in PRD together with other HSC Y3 weak lensing cosmology papers  see https://hscrelease.mtk.nao.ac.jp/doc/index.php/wly3/