Cosmological constraints from CODEX galaxy clusters spectroscopically confirmed by SDSS-IV/SPIDERS DR16

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Chitham , J I , Comparat , J , Finoguenov , A , Clerc , N , Kirkpatrick , C C , Damsted , S , Kukkola , A , Capasso , R , Nandra , K , Merloni , A , Bulbul , E , Rykoff , E S , Schneider , D P & Brownstein , J R 2020 , ' Cosmological constraints from CODEX galaxy clusters spectroscopically confirmed by SDSS-IV/SPIDERS DR16 ' , Monthly Notices of the Royal Astronomical Society , vol. 499 , no. 4 , pp. 4768-4784 . https://doi.org/10.1093/mnras/staa3044

Title: Cosmological constraints from CODEX galaxy clusters spectroscopically confirmed by SDSS-IV/SPIDERS DR16
Author: Chitham, J. Ider; Comparat, J.; Finoguenov, A.; Clerc, N.; Kirkpatrick, C. C.; Damsted, S.; Kukkola, A.; Capasso, R.; Nandra, K.; Merloni, A.; Bulbul, E.; Rykoff, E. S.; Schneider, D. P.; Brownstein, J. R.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2020-12
Language: eng
Number of pages: 17
Belongs to series: Monthly Notices of the Royal Astronomical Society
ISSN: 0035-8711
URI: http://hdl.handle.net/10138/324594
Abstract: This paper presents a cosmological analysis based on the properties of X-ray selected clusters of galaxies from the CODEX survey which have been spectroscopically followed up within the SPIDERS programme as part of the sixteenth data release (DR16) of SDSS-IV. The cosmological sub-sample contains a total of 691 clusters over an area of 5350 deg(2) with newly measured optical properties provided by a reanalysis of the CODEX source catalogue using redMaPPer and the DESI Legacy Imaging Surveys (DR8). Optical richness is used as a proxy for the cluster mass, and the combination of X-ray, optical, and spectroscopic information ensures that only confirmed virialized systems are considered. Clusters are binned in observed redshift, (z) over tilde is an element of [0.1, 0.6) and optical richness, (lambda) over tilde is an element of[25, 148) and the number of clusters in each bin is modelled as a function of cosmological and richness-mass scaling relation parameters. A high-purity sub-sample of 691 clusters is used in the analysis and best-fitting cosmological parameters are found to be Omega m(0) = 0.34(-0.05)(+0.09) and sigma(8) = 0.73(-0.03)(+0.03). The redshift evolution of the self-calibrated richness-mass relation is poorly constrained due to the systematic uncertainties associated with the X-ray component of the selection function (which assumes a fixed X-ray luminosity-mass relation with h = 0.7 and Omega m(0) = 0.30). Repeating the analysis with the assumption of no redshift evolution is found to improve the consistency between both cosmological and scaling relation parameters with respect to recent galaxy cluster analyses in the literature.
Subject: cosmological parameters
X-rays: galaxies: clusters
HALO MASS FUNCTION
BARYON ACOUSTIC-OSCILLATIONS
DARK ENERGY
INTRACLUSTER LIGHT
SCALING RELATIONS
REDSHIFT 0.8
SAMPLE
MAXBCG
CALIBRATION
ROSAT
115 Astronomy, Space science
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