Abstract
Using archival Xray observations and a lognormal population model, we estimate constraints on the intrinsic scatter in halo mass at fixed optical richness for a galaxy cluster sample identified in Dark Energy Survey YearOne (DESY1) data with the redMaPPer algorithm. We examine the scaling behaviour of Xray temperatures, T_{X}, with optical richness, λ_{RM}, for clusters in the redshift range 0.2 < z < 0.7. Xray temperatures are obtained from Chandra and XMM observations for 58 and 110 redMaPPer systems, respectively. Despite nonuniform sky coverage, the T_{X} measurements are > 50 per cent complete for clusters with λ_{RM} > 130. Regression analysis on the two samples produces consistent posterior scaling parameters, from which we derive a combined constraint on the residual scatter, σ_{ln} T  λ = 0.275 ± 0.019. Joined with constraints for T_{X} scaling with halo mass from the Weighing the Giants program and richnesstemperature covariance estimates from the LoCuSS sample, we derive the richnessconditioned scatter in mass, σ_{ln} M  λ = 0.30 ± 0.04 _{(stat)} ± 0.09 _{(sys)}, at an optical richness of approximately 100. Uncertainties in external parameters, particularly the slope and variance of the T_{X}mass relation and the covariance of T_{X} and λ_{RM} at fixed mass, dominate the systematic error. The 95 per cent confidence region from joint sample analysis is relatively broad, σ_{ln} M  _{λ} ∈ [0.14, 0.55], or a factor 10 in variance.
Original language  English 

Pages (fromto)  33413354 
Number of pages  14 
Journal  Monthly Notices of the Royal Astronomical Society 
Volume  490 
Issue number  3 
Early online date  26 Sep 2019 
DOIs  
Publication status  Published  1 Dec 2019 
Keywords
 Galaxies: clusters: general
 Xrays: galaxies: clusters
 RCUK
 STFC
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Data availability statement for 'Mass variance from archival Xray properties of Dark Energy Survey Year1 galaxy clusters'.
Thomas, D. (Creator), Oxford University Press, 26 Sep 2019
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