CODEX weak lensing mass catalogue and implications on the mass-richness relation

K. Kiiveri, D. Gruen, A. Finoguenov, T. Erben, L. Van Waerbeke, E. Rykoff, L. Miller, S. Hagstotz, R. Dupke, J. Patrick Henry, J. P. Kneib, G. Gozaliasl, C. C. Kirkpatrick, N. Cibirka, N. Clerc, M. Costanzi, E. S. Cypriano, E. Rozo, H. Shan, P. SpinelliJ. Valiviita, J. Weller

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The COnstrain Dark Energy with X-ray clusters (CODEX) sample contains the largest flux limited sample of X-ray clusters at 0.35 < z < 0.65. It was selected from ROSAT data in the 10 000 square degrees of overlap with BOSS, mapping a total number of 2770 high-z galaxy clusters. We present here the full results of the CFHT CODEX programme on cluster mass measurement, including a reanalysis of CFHTLS Wide data, with 25 individual lensing-constrained cluster masses. We employ lensfit shape measurement and perform a conservative colour-space selection and weighting of background galaxies. Using the combination of shape noise and an analytic covariance for intrinsic variations of cluster profiles at fixed mass due to large-scale structure, miscentring, and variations in concentration and ellipticity, we determine the likelihood of the observed shear signal as a function of true mass for each cluster. We combine 25 individual cluster mass likelihoods in a Bayesian hierarchical scheme with the inclusion of optical and X-ray selection functions to derive constraints on the slope α, normalization β, and scatter σlnλ|μ of our richness-mass scaling relation model in log-space: 〈In λ|μ〉 = αμ + β, with μ = ln (M200c/Mpiv), and Mpiv = 1014.81M⊙. We find a slope α = 0.49+0.20-0.15, normalization (β) = 84.0+9.2-14.8, and σln λ|μ = 0.17+0.13-0.09 using CFHT richness estimates. In comparison to other weak lensing richness-mass relations, we find the normalization of the richness statistically agreeing with the normalization of other scaling relations from a broad redshift range (0.0 < z < 0.65) and with different cluster selection (X-ray, Sunyaev-Zeldovich, and optical).

Original languageEnglish
Pages (from-to)1494-1526
Number of pages33
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - 1 Mar 2021
Externally publishedYes


  • cosmology: observations
  • galaxies: clusters: general
  • gravitational lensing: weak

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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