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

McClintock, T, Varga, T N, Gruen, D, Rozo, E, Rykoff, E S, Shin, T, Melchior, P, DeRose, J, Seitz, S, Dietrich, J P, Sheldon, E, Zhang, Y, von der Linden, A, Jeltema, T, Mantz, A B, Romer, A K, Allen, S, Becker, M R, Bermeo, A, Bhargava, S, Costanzi, M, Everett, S, Farahi, A, Hamaus, N, Hartley, W G, Hollowood, D L, Hoyle, B, Israel, H, Li, P, MacCrann, N, Morris, G, Palmese, A, Plazas, A A, Pollina, G, Rau, M M, Simet, M, Soares-Santos, M, Troxel, M A, Vergara Cervantes, C, Wechsler, R H, Zuntz, J, Abbott, T M C, Abdalla, F B, Allam, S, Annis, J, Avila, S, Bridle, S L, Brooks, D, Burke, D L, Carnero Rosell, A, Carrasco Kind, M, Carretero, J, Castander, F J, Crocce, M, Cunha, C E, D’Andrea, C B, da Costa, L N, Davis, C, De Vicente, J, Diehl, H T, Doel, P, Drlica-Wagner, A, Evrard, A E, Flaugher, B, Fosalba, P, Frieman, J, García-Bellido, J, Gaztanaga, E, Gerdes, D W, Giannantonio, T, Gruendl, R A, Gutierrez, G, Honscheid, K, James, D J, Kirk, D, Krause, E, Kuehn, K, Lahav, O, Li, T S, Lima, M, March, M, Marshall, J L, Menanteau, F, Miquel, R, Mohr, J J, Nord, B, Ogando, R L C, Roodman, A, Sanchez, E, Scarpine, V, Schindler, R, Sevilla-Noarbe, I, Smith, M, Smith, R C, Sobreira, F, Suchyta, E, Swanson, M E C, Tarle, G, Tucker, D L, Vikram, V, Walker, A R, Weller, J and DES Collaboration, (2018) Dark Energy Survey Year 1 results: weak lensing mass calibration of redMaPPer galaxy clusters. Monthly Notices of the Royal Astronomical Society, 482 (1). pp. 1352-1378. ISSN 0035-8711

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Abstract

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 λ and redshift z for λ≥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 |λ,z⟩=M 0 (λ/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 λ=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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QC Physics
Depositing User: Alice Jackson
Date Deposited: 14 Dec 2018 14:01
Last Modified: 02 Jul 2019 13:34
URI: http://sro.sussex.ac.uk/id/eprint/80473

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