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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.07613 |
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| _version_ | 1866916683569954816 |
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| author | Lindholm, Valtteri Finoguenov, Alexis Balaguera-Antolínez, Andrés Castro, Tiago |
| author_facet | Lindholm, Valtteri Finoguenov, Alexis Balaguera-Antolínez, Andrés Castro, Tiago |
| contents | Aims. We analyze the clustering of galaxy clusters in a large contiguous sample, the Constrain Dark Energy with X-ray (CODEX) sample. We construct a likelihood for cosmological parameters by comparing the measured clustering signal and a theoretical prediction, and use this to obtain parameter constraints. Methods. We measured the three multipole moments (monopole, quadrupole, and hexadecapole, $\ell = 0, 2, 4$) of the power spectrum of a subset of the CODEX clusters. To fully model cluster clustering, we also determined the expected clustering bias of the sample using estimates for the cluster masses and a mass-to-bias model calibrated using N-body simulations. We estimated the covariance matrix of the measured power spectrum multipoles using a set of simulated dark-matter halo catalogs. Combining all these ingredients, we performed a Markov chain Monte Carlo sampling of cosmological parameters $Ω_m$ and $σ_8$ to obtain their posterior. Results. We found the CODEX clustering signal to be consistent with an earlier X-ray selected cluster sample, the REFLEX II sample. We also found that the measured power spectrum multipoles are compatible with the predicted, bias-scaled linear matter power spectrum when the cosmological parameters determined by the Planck satellite are assumed. Furthermore, we found the marginalized parameter constraints of $Ω_m = 0.24^{+0.06}_{-0.04}$ and $σ_8 = 1.13^{+0.43}_{-0.24}$. The full 2D posterior is consistent, for example, with the Planck cosmology within the 68% confidence region. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_07613 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Power spectrum of the CODEX clusters Lindholm, Valtteri Finoguenov, Alexis Balaguera-Antolínez, Andrés Castro, Tiago Cosmology and Nongalactic Astrophysics Aims. We analyze the clustering of galaxy clusters in a large contiguous sample, the Constrain Dark Energy with X-ray (CODEX) sample. We construct a likelihood for cosmological parameters by comparing the measured clustering signal and a theoretical prediction, and use this to obtain parameter constraints. Methods. We measured the three multipole moments (monopole, quadrupole, and hexadecapole, $\ell = 0, 2, 4$) of the power spectrum of a subset of the CODEX clusters. To fully model cluster clustering, we also determined the expected clustering bias of the sample using estimates for the cluster masses and a mass-to-bias model calibrated using N-body simulations. We estimated the covariance matrix of the measured power spectrum multipoles using a set of simulated dark-matter halo catalogs. Combining all these ingredients, we performed a Markov chain Monte Carlo sampling of cosmological parameters $Ω_m$ and $σ_8$ to obtain their posterior. Results. We found the CODEX clustering signal to be consistent with an earlier X-ray selected cluster sample, the REFLEX II sample. We also found that the measured power spectrum multipoles are compatible with the predicted, bias-scaled linear matter power spectrum when the cosmological parameters determined by the Planck satellite are assumed. Furthermore, we found the marginalized parameter constraints of $Ω_m = 0.24^{+0.06}_{-0.04}$ and $σ_8 = 1.13^{+0.43}_{-0.24}$. The full 2D posterior is consistent, for example, with the Planck cosmology within the 68% confidence region. |
| title | Power spectrum of the CODEX clusters |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2504.07613 |