photo-3x2-pt: Cosmology from cosmic shear and galaxy clustering with a single photometric galaxy catalog
Abstract
We perform a joint cosmological analysis using angular power spectra of galaxy clustering, galaxy-shear cross correlation, and cosmic shear (hereafter referred to as photo-3x2-pt) measured from the Hyper Suprime-Cam year-3 (HSC-Y3) weak lensing shape catalog. We employ the pseudo-Cℓ method to measure these power spectra and use the template deprojection method to mitigate systematics in the galaxy density maps. We perform a standard Bayesian likelihood analysis for cosmological inference based on the measured photo-3x2-pt, including contributions from intrinsic alignments of galaxies, galaxy clustering bias, lensing magnification effect, baryonic feedback effect, and source redshift distribution errors. For a flat cold dark matter model, we find a 68% credible interval of 0.76 ≤ S8 ≤ 0.81. This result is consistent with the HSC-Y3 cosmic shear analyses (Dalal et al. 2023, Li et al. 2023) but is ∼ 25% tighter. We also find that the measured B-mode power spectra are consistent with zero. We also perform a performance test using mock catalogs that mimic the HSC-Y3 data to validate our photo-3x2-pt analysis. Through Bayesian parameter inference of mock data, we verify that unbiased estimates can be obtained for the key cosmological and nuisance parameters, including S8, intrinsic alignment model parameters, galaxy clustering bias, and shift parameters of the source redshift distributions.
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BibTeX
@misc{hamana2026photo3x2pt,
title = {{photo-3x2-pt: Cosmology from cosmic shear and galaxy clustering with a single photometric galaxy catalog}},
author = {Takashi Hamana},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2608.05530},
eprint = {2608.05530},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.05530},
}
RIS
TY - UNPB
TI - photo-3x2-pt: Cosmology from cosmic shear and galaxy clustering with a single photometric galaxy catalog
AU - Takashi Hamana
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2608.05530
UR - https://arxiv.org/abs/2608.05530
AB - We perform a joint cosmological analysis using angular power spectra of galaxy clustering, galaxy-shear cross correlation, and cosmic shear (hereafter referred to as photo-3x2-pt) measured from the Hyper Suprime-Cam year-3 (HSC-Y3) weak lensing shape catalog. We employ the pseudo-C_ℓ method to measure these power spectra and use the template deprojection method to mitigate systematics in the galaxy density maps. We perform a standard Bayesian likelihood analysis for cosmological inference based on the measured photo-3x2-pt, including contributions from intrinsic alignments of galaxies, galaxy clustering bias, lensing magnification effect, baryonic feedback effect, and source redshift distribution errors. For a flat cold dark matter model, we find a 68% credible interval of 0.76 ≤ S_8 ≤ 0.81. This result is consistent with the HSC-Y3 cosmic shear analyses (Dalal et al. 2023, Li et al. 2023) but is ∼ 25% tighter. We also find that the measured B-mode power spectra are consistent with zero. We also perform a performance test using mock catalogs that mimic the HSC-Y3 data to validate our photo-3x2-pt analysis. Through Bayesian parameter inference of mock data, we verify that unbiased estimates can be obtained for the key cosmological and nuisance parameters, including S_8, intrinsic alignment model parameters, galaxy clustering bias, and shift parameters of the source redshift distributions.
ER -