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Dark Energy Survey Year 1 results: weak lensing mass calibration of redMaPPer galaxy clusters

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Version 2 2023-06-12, 07:31
Version 1 2023-06-09, 16:02
journal contribution
posted on 2023-06-12, 07:31 authored by T McClintock, T N Varga, D Gruen, E Rozo, E S Rykoff, T Shin, P Melchior, J DeRose, S Seitz, J P Dietrich, E Sheldon, Y Zhang, A von der Linden, T Jeltema, A B Mantz, Kathy RomerKathy Romer, S Allen, M R Becker, Alberto Bermeo, Sunayana Bhargava, M Costanzi, S Everett, A Farahi, N Hamaus, W G Hartley, D L Hollowood, B Hoyle, H Israel, P Li, N MacCrann, G Morris, A Palmese, A A Plazas, G Pollina, M M Rau, M Simet, M Soares-Santos, M A Troxel, Carlos Fernando Vergara Cervantes, R H Wechsler, J Zuntz, T M C Abbott, F B Abdalla, S Allam, J Annis, S Avila, S L Bridle, D Brooks, D L Burke, A Carnero Rosell, M Carrasco Kind, J Carretero, F J Castander, M Crocce, C E Cunha, C B D’Andrea, L N da Costa, C Davis, J De Vicente, H T Diehl, P Doel, A Drlica-Wagner, A E Evrard, B Flaugher, P Fosalba, J Frieman, J García-Bellido, E Gaztanaga, D W Gerdes, T Giannantonio, R A Gruendl, G Gutierrez, K Honscheid, D J James, D Kirk, E Krause, K Kuehn, O Lahav, T S Li, M Lima, M March, J L Marshall, F Menanteau, R Miquel, J J Mohr, B Nord, R L C Ogando, A Roodman, E Sanchez, V Scarpine, R Schindler, I Sevilla-Noarbe, M Smith, R C Smith, F Sobreira, E Suchyta, M E C Swanson, G Tarle, D L Tucker, V Vikram, A R Walker, J Weller, DES Collaboration
We constrain the mass--richness scaling relation of redMaPPer galaxy clusters identified in the Dark Energy Survey Year 1 data using weak gravitational lensing. We split clusters into 4×3 bins of richness ? and redshift z for ?=20 and 0.2=z=0.65 and measure the mean masses of these bins using their stacked weak lensing signal. By modeling the scaling relation as ?M 200m |?,z?=M 0 (?/40) F ((1+z)/1.35) G , we constrain the normalization of the scaling relation at the 5.0 per cent level as M 0 =[3.081±0.075(stat)±0.133(sys)]·10 14 M ? at ?=40 and z=0.35 . The richness scaling index is constrained to be F=1.356±0.051 (stat)±0.008 (sys) and the redshift scaling index G=-0.30±0.30 (stat)±0.06 (sys) . These are the tightest measurements of the normalization and richness scaling index made to date. We use a semi-analytic covariance matrix to characterize the statistical errors in the recovered weak lensing profiles. Our analysis accounts for the following sources of systematic error: shear and photometric redshift errors, cluster miscentering, cluster member dilution of the source sample, systematic uncertainties in the modeling of the halo--mass correlation function, halo triaxiality, and projection effects. We discuss prospects for reducing this systematic error budget, which dominates the uncertainty on M 0. Our result is in excellent agreement with, but has significantly smaller uncertainties than, previous measurements in the literature, and augurs well for the power of the DES cluster survey as a tool for precision cosmology and upcoming galaxy surveys such as LSST, Euclid and WFIRST.


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Monthly Notices of the Royal Astronomical Society




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