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

P. Melchior, D. Gruen, T. McClintock, T. N. Varga, E. Sheldon, E. Rozo, A. Amara, M. R. Becker, B. A. Benson, A. Bermeo, S. L. Bridle, J. Clampitt, J. P. Dietrich, W. G. Hartley, D. Hollowood, B. Jain, M. Jarvis, T. Jeltema, T. Kacprzak, N. MacCrannE. S. Rykoff, A. Saro, E. Suchyta, M. A. Troxel, J. Zuntz, C. Bonnett, A. A. Plazas, T. M. C. Abbott, F. B. Abdalla, J. Annis, A. Benoit-Lévy, G. M. Bernstein, E. Bertin, D. Brooks, E. Buckley-Geer, A. Carnero Rosell, M. Carrasco Kind, J. Carretero, C. E. Cunha, C. B. D'Andrea, L. N. da Costa, S. Desai, T. F. Eifler, B. Flaugher, P. Fosalba, J. García-Bellido, E. Gaztanaga, D. W. Gerdes, R. A. Gruendl, J. Gschwend, G. Gutierrez, K. Honscheid, D. J. James, D. Kirk, E. Krause, K. Kuehn, N. Kuropatkin, O. Lahav, M. Lima, M. A. G. Maia, M. March, P. Martini, F. Menanteau, C. J. Miller, R. Miquel, J. J. Mohr, R. C. Nichol, R. Ogando, A. K. Romer, E. Sanchez, V. Scarpine, I. Sevilla-Noarbe, R. C. Smith, M. Soares-Santos, F. Sobreira, M. E. C. Swanson, G. Tarle, D. Thomas, A. R. Walker, J. Weller, Y. Zhang

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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 ≤ λ ≤ 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(λ,z)∝M0λF(1+z). We find M0≡⟨M200m|λ=30,z=0.5⟩=[2.35±0.22 (stat)±0.12 (sys)]× 1014 M, 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.
Original languageEnglish
Pages (from-to)4899-4920
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date16 May 2017
Publication statusPublished - Aug 2017


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