Unifying cluster and galaxy cosmology analyses using the galaxy-halo connection
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arXiv
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| Hauptverfasser: | , , , , , |
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| Format: | Preprint |
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2026
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| author | Cao, Shulei Wu, Hao-Yi Salcedo, Andrés N. Weinberg, David H. Schaller, Matthieu Schaye, Joop |
| author_facet | Cao, Shulei Wu, Hao-Yi Salcedo, Andrés N. Weinberg, David H. Schaller, Matthieu Schaye, Joop |
| contents | Galaxies and galaxy clusters trace the same cosmic density field, but their statistics have been modeled separately in cosmological analyses. We present a unified, simulation-based framework to model them using the galaxy-halo connection. Our analysis includes cluster lensing, galaxy clustering, and galaxy-cluster cross-correlation. We validate our method on the FLAMINGO hydrodynamic simulation. Relative to the cluster-only approach, combining these probes improves the $σ_8-Ω_m$ figure of merit by a factor of 15. Our framework enables stringent tests of cosmological models and exploits small-scale information. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16353 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Unifying cluster and galaxy cosmology analyses using the galaxy-halo connection Cao, Shulei Wu, Hao-Yi Salcedo, Andrés N. Weinberg, David H. Schaller, Matthieu Schaye, Joop Cosmology and Nongalactic Astrophysics Galaxies and galaxy clusters trace the same cosmic density field, but their statistics have been modeled separately in cosmological analyses. We present a unified, simulation-based framework to model them using the galaxy-halo connection. Our analysis includes cluster lensing, galaxy clustering, and galaxy-cluster cross-correlation. We validate our method on the FLAMINGO hydrodynamic simulation. Relative to the cluster-only approach, combining these probes improves the $σ_8-Ω_m$ figure of merit by a factor of 15. Our framework enables stringent tests of cosmological models and exploits small-scale information. |
| title | Unifying cluster and galaxy cosmology analyses using the galaxy-halo connection |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2601.16353 |