Weak-lensing mass calibration of redMaPPer galaxy clusters in Dark Energy Survey Science Verification data

Melchior, P and Gruen, D and McClintock, T and Varga, T N and Sheldon, E and Rozo, E and Amara, A and Becker, M R and Benson, B A and Bermeo, A and Bridle, S L and Clampitt, J and Dietrich, J P and Hartley, W G and Hollowood, D and Jain, B and Jarvis, M and Jeltema, T and Kacprzak, T and MacCrann, N and Rykoff, E S and Saro, A and Suchyta, E and Troxel, M A and Zuntz, J and Bonnett, C and Plazas, A A and Abbott, T M C and Abdalla, F B and Annis, J and Benoit-Lévy, A and Bernstein, G M and Bertin, E and Brooks, D and Buckley-Geer, E and Carnero Rosell, A and Carrasco Kind, M and Carretero, J and Cunha, C E and D’Andrea, C B and da Costa, L N and Desai, Shantanu and et al, . (2017) Weak-lensing mass calibration of redMaPPer galaxy clusters in Dark Energy Survey Science Verification data. Monthly Notices of the Royal Astronomical Society, 469 (4). pp. 4899-4920. ISSN 0035-8711

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Abstract

We use weak-lensing shear measurements to determine the mean mass of optically selected galaxy clusters in Dark Energy Survey Science Verification data. In a blinded analysis, we split the sample of more than 8000 redMaPPer clusters into 15 subsets, spanning ranges in the richness parameter 5 <= lambda <= 180 and redshift 0.2 <= z <= 0.8, and fit the averaged mass density contrast profiles with a model that accounts for seven distinct sources of systematic uncertainty: shear measurement and photometric redshift errors; cluster-member contamination; miscentring; deviations from the NFW halo profile; halo triaxiality and line-of-sight projections. We combine the inferred cluster masses to estimate the joint scaling relation between mass, richness and redshift, M(lambda, z). M-0 lambda(F) (1 + z)(G). We find M-0 equivalent to M-200m vertical bar lambda = 30, z = 0.5 = [2.35 +/- 0.22 (stat) +/- 0.12 (sys)] x 10(14) M circle dot, with F = 1.12 +/- 0.20 (stat) +/- 0.06 (sys) and G = 0.18 +/- 0.75 (stat) +/- 0.24 (sys). The amplitude of the mass-richness relation is in excellent agreement with the weak-lensing calibration of redMaPPer clusters in SDSS by Simet et al. and with the Saro et al. calibration based on abundance matching of SPT-detected clusters. Our results extend the redshift range over which the mass-richness relation of redMaPPer clusters has been calibrated with weak lensing from z <= 0.3 to z <= 0.8. Calibration uncertainties of shear measurements and photometric redshift estimates dominate our systematic error budget and require substantial improvements for forthcoming studies.

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