Issue |
A&A
Volume 697, May 2025
|
|
---|---|---|
Article Number | A93 | |
Number of page(s) | 8 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361/202453402 | |
Published online | 08 May 2025 |
Power spectrum of the CODEX clusters
1
Department of Physics, University of Helsinki, PO Box 64 00014 Helsinki, Finland
2
Helsinki Institute of Physics, University of Helsinki, Gustaf Hällströmin katu 2, Helsinki, Finland
3
Instituto de Astrofísica de Canarias, s/n, E-38205 La Laguna, Tenerife, Spain
4
Departamento de Astrofísica, Universidad de La Laguna, E-38206 La Laguna, Tenerife, Spain
5
INAF-Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, 34143 Trieste, Italy
6
INFN, Sezione di Trieste, Via Valerio 2, 34127 Trieste, TS, Italy
7
IFPU, Institute for Fundamental Physics of the Universe, Via Beirut 2, 34151 Trieste, Italy
⋆ Corresponding author: valtteri.lindholm@helsinki.fi
Received:
11
December
2024
Accepted:
19
March
2025
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, ℓ = 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 Ωm and σ8 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 Ωm = 0.24−0.04+0.06 and σ8 = 1.13−0.24+0.43. The full 2D posterior is consistent, for example, with the Planck cosmology within the 68% confidence region.
Key words: galaxies: clusters: general / cosmology: observations / large-scale structure of Universe
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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