KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering and galaxy-galaxy lensing
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2022
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| _version_ | 1866911988629635072 |
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| author | Dvornik, Andrej Heymans, Catherine Asgari, Marika Mahony, Constance Joachimi, Benjamin Bilicki, Maciej Chisari, Elisa Hildebrandt, Hendrik Hoekstra, Henk Johnston, Harry Kuijken, Konrad Mead, Alexander Miyatake, Hironao Nishimichi, Takahiro Reischke, Robert Unruh, Sandra Wright, Angus H. |
| author_facet | Dvornik, Andrej Heymans, Catherine Asgari, Marika Mahony, Constance Joachimi, Benjamin Bilicki, Maciej Chisari, Elisa Hildebrandt, Hendrik Hoekstra, Henk Johnston, Harry Kuijken, Konrad Mead, Alexander Miyatake, Hironao Nishimichi, Takahiro Reischke, Robert Unruh, Sandra Wright, Angus H. |
| contents | We present constraints on the flat $Λ$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 $S_8=σ_8\sqrt{Ω_{\mathrm{m}}/0.3}=0.773^{+0.028}_{-0.030}$, and the matter density parameter $Ω_{\mathrm{m}}=0.290^{+0.021}_{-0.017}$. 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. Varying the width of the satellite galaxy distribution with an additional parameter yields a strong preference for sub-Poissonian variance, improving the goodness of fit by 0.18 in reduced $χ^{2}$ value compared to a fixed Poisson distribution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2210_03110 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering and galaxy-galaxy lensing Dvornik, Andrej Heymans, Catherine Asgari, Marika Mahony, Constance Joachimi, Benjamin Bilicki, Maciej Chisari, Elisa Hildebrandt, Hendrik Hoekstra, Henk Johnston, Harry Kuijken, Konrad Mead, Alexander Miyatake, Hironao Nishimichi, Takahiro Reischke, Robert Unruh, Sandra Wright, Angus H. Cosmology and Nongalactic Astrophysics We present constraints on the flat $Λ$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 $S_8=σ_8\sqrt{Ω_{\mathrm{m}}/0.3}=0.773^{+0.028}_{-0.030}$, and the matter density parameter $Ω_{\mathrm{m}}=0.290^{+0.021}_{-0.017}$. 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. Varying the width of the satellite galaxy distribution with an additional parameter yields a strong preference for sub-Poissonian variance, improving the goodness of fit by 0.18 in reduced $χ^{2}$ value compared to a fixed Poisson distribution. |
| title | KiDS-1000: Combined halo-model cosmology constraints from galaxy abundance, galaxy clustering and galaxy-galaxy lensing |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2210.03110 |