TY - UNPB
T1 - KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering and galaxy-galaxy lensing
AU - Dvornik, Andrej
AU - Heymans, Catherine
AU - Asgari, Marika
AU - Mahony, Constance
AU - Joachimi, Benjamin
AU - Bilicki, Maciej
AU - Chisari, Elisa
AU - Hildebrandt, Hendrik
AU - Hoekstra, Henk
AU - Johnston, Harry
AU - Kuijken, Konrad
AU - Mead, Alexander
AU - Miyatake, Hironao
AU - Nishimichi, Takahiro
AU - Reischke, Robert
AU - Unruh, Sandra
AU - Wright, Angus H.
PY - 2022/10/6
Y1 - 2022/10/6
N2 - We present constraints on the flat $\Lambda$CDM cosmological model through a joint analysis of galaxy abundance, galaxy clustering and galaxy-galaxy lensing observables with the Kilo-Degree Survey. Our theoretical model combines a flexible conditional stellar mass function, to describe the galaxy-halo connection, with a cosmological N-body simulation-calibrated halo model to describe the non-linear matter field. Our magnitude-limited bright galaxy sample combines 9-band optical-to-near-infrared photometry with an extensive and complete spectroscopic training sample to provide accurate redshift and stellar mass estimates. Our faint galaxy sample provides a background of accurately calibrated lensing measurements. We constrain the structure growth parameter $S_8 = \sigma_8 \sqrt{\Omega_{\mathrm{m}}/0.3} = 0.773^{+0.028}_{-0.030}$, and the matter density parameter $\Omega_{\mathrm{m}} = 0.290^{+0.021}_{-0.017}$. The galaxy-halo connection model adopted in the work is shown to be in agreement with previous studies. Our constraints on cosmological parameters are comparable to, and consistent with, joint '$3\times2{\mathrm{pt}}$' clustering-lensing analyses that additionally include a cosmic shear observable. This analysis therefore brings attention to the significant constraining power in the often-excluded non-linear scales for galaxy clustering and galaxy-galaxy lensing observables. By adopting a theoretical model that accounts for non-linear halo bias, halo exclusion, scale-dependent galaxy bias and the impact of baryon feedback, this work demonstrates the potential and a way forward to include non-linear scales in cosmological analyses.
AB - We present constraints on the flat $\Lambda$CDM cosmological model through a joint analysis of galaxy abundance, galaxy clustering and galaxy-galaxy lensing observables with the Kilo-Degree Survey. Our theoretical model combines a flexible conditional stellar mass function, to describe the galaxy-halo connection, with a cosmological N-body simulation-calibrated halo model to describe the non-linear matter field. Our magnitude-limited bright galaxy sample combines 9-band optical-to-near-infrared photometry with an extensive and complete spectroscopic training sample to provide accurate redshift and stellar mass estimates. Our faint galaxy sample provides a background of accurately calibrated lensing measurements. We constrain the structure growth parameter $S_8 = \sigma_8 \sqrt{\Omega_{\mathrm{m}}/0.3} = 0.773^{+0.028}_{-0.030}$, and the matter density parameter $\Omega_{\mathrm{m}} = 0.290^{+0.021}_{-0.017}$. The galaxy-halo connection model adopted in the work is shown to be in agreement with previous studies. Our constraints on cosmological parameters are comparable to, and consistent with, joint '$3\times2{\mathrm{pt}}$' clustering-lensing analyses that additionally include a cosmic shear observable. This analysis therefore brings attention to the significant constraining power in the often-excluded non-linear scales for galaxy clustering and galaxy-galaxy lensing observables. By adopting a theoretical model that accounts for non-linear halo bias, halo exclusion, scale-dependent galaxy bias and the impact of baryon feedback, this work demonstrates the potential and a way forward to include non-linear scales in cosmological analyses.
KW - Astrophysics - Cosmology and Nongalactic Astrophysics
U2 - 10.48550/arXiv.2210.03110
DO - 10.48550/arXiv.2210.03110
M3 - Preprint
SP - 1
EP - 24
BT - KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering and galaxy-galaxy lensing
PB - arXiv
ER -