CODEX Weak Lensing Mass Catalogue and implications on the mass-richness relation

Abstract

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 program 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 $\alpha$, normalization $\beta$, and scatter ${\sigma }_{\ln \lambda |\mu }$ of our richness-mass scaling relation model in log-space: $⟨\ln \lambda |\mu ⟩=\alpha \mu +\beta$, with $\mu =\ln (M_{200c}/M_{\mathrm{piv}})$, and $M_{\mathrm{piv}}=10^{14.81}{M}_{\odot }$. We find a slope $\alpha =0.49_{-0.15}^{+0.20}$, normalization $\exp (\beta )=84.0_{-14.8}^{+9.2}$ and ${\sigma }_{\ln \lambda |\mu }=0.17_{-0.09}^{+0.13}$ 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).

37 pages, 12 figures

References in corpus (20)

• Array Programming with NumPy
• The NumPy array: a structure for efficient numerical computation
• Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-square-degree SPT-SZ survey
• Testing X-ray Measurements of Galaxy Clusters with Cosmological Simulations
• Second ROSAT all-sky survey (2RXS) source catalogue
• Weighing the Giants IV: Cosmology and Neutrino Mass
• Comparison of weak lensing masses and X-ray properties of galaxy clusters
• CARS: the CFHTLS-Archive-Research Survey; I. Five-band multi-colour data from 37 sq. deg. CFHTLS-Wide observations
• Means of confusion: how pixel noise affects shear estimates for weak gravitational lensing
• Metacalibration: Direct Self-Calibration of Biases in Shear Measurement
• SPIDERS: the spectroscopic follow-up of X-ray selected clusters of galaxies in SDSS-IV
• LoCuSS: Scaling relations between galaxy cluster mass, gas, and stellar content
• Cosmic variance of the galaxy cluster weak lensing signal
• BLOX: The Bonn Lensing, Optical, and X-ray selected galaxy clusters -- I. Cluster catalog construction
• Mining the gap: evolution of the magnitude gap in X-ray galaxy groups from the 3 square degree XMM coverage of CFHTLS
• Detection of anti-correlation of hot and cold baryons in galaxy clusters
• CODEX Weak Lensing: Concentration of Galaxy Clusters at z ~ 0.5
• Weak Lensing Analysis of CODEX Clusters using Dark Energy Camera Legacy Survey : Mass-Richness Relation
• HIFLUGCS: X-ray luminosity -- dynamical mass relation and its implications for mass calibrations with the SPIDERS and 4MOST surveys
• Testing Emergent Gravity on Galaxy Cluster Scales

Cited by in corpus (1)

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