Max-Planck Institut für Extraterrestrische Physik, Postfach 1312, D-85741 Garching bei München, Germany
Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, FI-00014 Helsinki, Finland
IRAP, Université de Toulouse, CNRS, UPS, CNES, F-31028 Toulouse, France
The Oskar Klein Centre, Department of Physics, Stockholm University, Albanova University Center, SE-106 91 Stockholm, Sweden
Kavli Institute for Particle Astrophysics & Cosmology, Stanford University, PO Box 2450, Stanford, CA 94305, USA, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA
Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USA, Institute for Gravitation and the Cosmos, The Pennsylvania State University, University Park, PA 16802, USA
Department of Physics and Astronomy, University of Utah, 115 S. 1400 E., Salt Lake City, UT 84112, USA
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, $$\tilde{z} \in \left[0.1, 0.6 \right)$$ and optical richness, $$\tilde{\lambda } \in \left[25, 148 \right)$$ 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 $$\Omega _{m_{0}}=0.34^{+0.09}_{-0.05}$$ 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.
Ider Chitham, J., et al. "Cosmological constraints from CODEX galaxy clusters spectroscopically confirmed by SDSS-IV/SPIDERS DR16." Monthly Notices of the Royal Astronomical Society, vol. 499, no. 4, Oct. 2020. https://doi.org/10.1093/mnras/staa3044
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). https://doi.org/10.1093/mnras/staa3044
Ider Chitham, J., Comparat, J., Finoguenov, A., et al., "Cosmological constraints from CODEX galaxy clusters spectroscopically confirmed by SDSS-IV/SPIDERS DR16," Monthly Notices of the Royal Astronomical Society 499, no. 4 (2020), https://doi.org/10.1093/mnras/staa3044
@article{osti_1701903,
author = {Ider Chitham, J. and Comparat, J. and Finoguenov, A. and Clerc, N. and Kirkpatrick, C. and Damsted, S. and Kukkola, A. and Capasso, R. and Nandra, K. and Merloni, A. and others},
title = {Cosmological constraints from CODEX galaxy clusters spectroscopically confirmed by SDSS-IV/SPIDERS DR16},
annote = {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, $\tilde{z} \in \left[0.1, 0.6 \right)$ and optical richness, $\tilde{\lambda } \in \left[25, 148 \right)$ 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 $\Omega _{m_{0}}=0.34^{+0.09}_{-0.05}$ 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.},
doi = {10.1093/mnras/staa3044},
url = {https://www.osti.gov/biblio/1701903},
journal = {Monthly Notices of the Royal Astronomical Society},
issn = {ISSN 0035-8711},
number = {4},
volume = {499},
place = {United Kingdom},
publisher = {Royal Astronomical Society},
year = {2020},
month = {10}}
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1701903
Alternate ID(s):
OSTI ID: 1768601
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 499; ISSN 0035-8711