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

J. Ider Chitham; J. Comparat; A. Finoguenov; N. Clerc; C. Kirkpatrick; S. Damsted; A. Kukkola; R. Capasso; K. Nandra; A. Merloni; E. Bulbul; E. S. Rykoff; D. P. Schneider; J. R. Brownstein

doi:10.1093/mnras/staa3044

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

J. Ider Chitham, J. Comparat, A. Finoguenov, N. Clerc, C. Kirkpatrick, S. Damsted, A. Kukkola, R. Capasso, K. Nandra, A. Merloni, E. Bulbul, E. S. Rykoff, D. P. Schneider, J. R. Brownstein

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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 deg2 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 [0.1, 0.6) and optical richness, λ [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 Ωm0=0.34+0.09-0.05 and σ8=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 Ωm0=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.

Original language	English (US)
Pages (from-to)	4768-4784
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	499
Issue number	4
DOIs	https://doi.org/10.1093/mnras/staa3044
State	Published - Dec 1 2020

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Astronomy and Astrophysics
Space and Planetary Science

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Ider Chitham, J., Comparat, J., Finoguenov, A., Clerc, N., Kirkpatrick, 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, 499(4), 4768-4784. https://doi.org/10.1093/mnras/staa3044

@article{88b47b6393914bd287980c7cd3dd9d74,

title = "Cosmological constraints from CODEX galaxy clusters spectroscopically confirmed by SDSS-IV/SPIDERS DR16",

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 deg2 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 [0.1, 0.6) and optical richness, λ [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 Ωm0=0.34+0.09-0.05 and σ8=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 Ωm0=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.",

author = "{Ider Chitham}, J. and J. Comparat and A. Finoguenov and N. Clerc and C. Kirkpatrick and S. Damsted and A. Kukkola and R. Capasso and K. Nandra and A. Merloni and E. Bulbul and Rykoff, {E. S.} and Schneider, {D. P.} and Brownstein, {J. R.}",

note = "Publisher Copyright: {\textcopyright} 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2020",

month = dec,

day = "1",

doi = "10.1093/mnras/staa3044",

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Ider Chitham, J, Comparat, J, Finoguenov, A, Clerc, N, Kirkpatrick, C, Damsted, S, Kukkola, A, Capasso, R, Nandra, K, Merloni, A, Bulbul, E, Rykoff, ES, Schneider, DP & Brownstein, JR 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

TY - JOUR

T1 - Cosmological constraints from CODEX galaxy clusters spectroscopically confirmed by SDSS-IV/SPIDERS DR16

AU - Ider Chitham, J.

AU - Comparat, J.

AU - Finoguenov, A.

AU - Clerc, N.

AU - Kirkpatrick, C.

AU - Damsted, S.

AU - Kukkola, A.

AU - Capasso, R.

AU - Nandra, K.

AU - Merloni, A.

AU - Bulbul, E.

AU - Rykoff, E. S.

AU - Schneider, D. P.

AU - Brownstein, J. R.

PY - 2020/12/1

Y1 - 2020/12/1

N2 - 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 deg2 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 [0.1, 0.6) and optical richness, λ [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 Ωm0=0.34+0.09-0.05 and σ8=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 Ωm0=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.

AB - 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 deg2 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 [0.1, 0.6) and optical richness, λ [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 Ωm0=0.34+0.09-0.05 and σ8=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 Ωm0=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.

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DO - 10.1093/mnras/staa3044

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

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

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