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Clustering of CODEX clusters

Lindholm, V, Finoguenov, A, Comparat, J, Kirkpatrick, CC, Rykoff, E, Clerc, N, Collins, CA, Damsted, S, Ider Chitham, J and Padilla, N (2021) Clustering of CODEX clusters. Astronomy and Astrophysics, 646. ISSN 0004-6361

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Context. The clustering of galaxy clusters links the spatial nonuniformity of dark matter halos to the growth of the primordial spectrum of perturbations. The amplitude of the clustering signal is widely used to estimate the halo mass of astrophysical objects. The advent of cluster mass calibrations enables using clustering in cosmological studies. Aims. We analyze the autocorrelation function of a large contiguous sample of galaxy clusters, the Constrain Dark Energy with X-ray (CODEX) sample, in which we take particular care of cluster definition. These clusters were X-ray selected using the ROentgen SATellite All-Sky Survey and then identified as galaxy clusters using the code redMaPPer run on the photometry of the Sloan Digital Sky Survey. We develop methods for precisely accounting for the sample selection effects on the clustering and demonstrate their robustness using numerical simulations. Methods. Using the clean CODEX sample, which was obtained by applying a redshift-dependent richness selection, we computed the two-point autocorrelation function of galaxy clusters in the 0.1<z<0.3 and 0.3<z<0.5 redshift bins. We compared the bias in the measured correlation function with values obtained in numerical simulations using a similar cluster mass range. Results. By fitting a power law, we measured a correlation length r0=18.7±1.1 and slope γ=1.98±0.14 for the correlation function in the full redshift range. By fixing the other cosmological parameters to their nine-year Wilkinson Microwave Anisotropy Probe values, we reproduced the observed shape of the correlation function under the following cosmological conditions: ωm0 = 0.22-0.03+0.04 and S8 = σ8(ωm0/0.3)0.5 = 0.85-0.08+0.10 with estimated additional systematic errors of σωm0=0.02 and σS8=0.20. We illustrate the complementarity of clustering constraints by combining them with CODEX cosmological constraints based on the X-ray luminosity function, deriving ωm0 = 0.25±0.01 and σ8 = 0.81-0.02+0.01 with an estimated additional systematic error of σωm0=0.07 and σσ8=0.04. The mass calibration and statistical quality of the mass tracers are the dominant source of uncertainty. © ESO 2021.

Item Type: Article
Additional Information: Clustering of CODEX clusters V. Lindholm, A. Finoguenov, J. Comparat, C. C. Kirkpatrick, E. Rykoff, N. Clerc, C. Collins, S. Damsted, J. Ider Chitham and N. Padilla A&A, 646 (2021) A8 Published online: 29 January 2021 DOI: 10.1051/0004-6361/202038807
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: EDP Sciences
Date Deposited: 16 Mar 2021 12:16
Last Modified: 04 Sep 2021 05:46
DOI or ID number: 10.1051/0004-6361/202038807
URI: https://researchonline.ljmu.ac.uk/id/eprint/14626
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