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

Published

Journal Article

© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. 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 modelling the scaling relation as 〈M200m|λ, z〉=M0(λ/40)F((1+z)/1.35)G,we constrain the normalization of the scaling relation at the 5.0 per cent level, finding M0 = [3.081 ± 0.075(stat) ± 0.133(sys)] · 1014M⊙ at λ = 40 and z = 0.35. The recovered richness scaling index is 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 from a weak lensing experiment. 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 miscentring, cluster member dilution of the source sample, systematic uncertainties in the modelling of the halo-mass correlation function, halo triaxiality, and projection effects.We discuss prospects for reducing our systematic error budget, which dominates the uncertainty on M0. 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.

Full Text

Duke Authors

Cited Authors

  • McClintock, T; Varga, TN; Gruen, D; Rozo, E; Rykoff, ES; Shin, T; Melchior, P; DeRose, J; Seitz, S; Dietrich, JP; Sheldon, E; Zhang, Y; von der Linden, A; Jeltema, T; Mantz, AB; Romer, AK; Allen, S; Becker, MR; Bermeo, A; Bhargava, S; Costanzi, M; Everett, S; Farahi, A; Hamaus, N; Hartley, WG; Hollowood, DL; Hoyle, B; Israel, H; Li, P; MacCrann, N; Morris, G; Palmese, A; Plazas, AA; Pollina, G; Rau, MM; Simet, M; Soares-Santos, M; Troxel, MA; Vergara Cervantes, C; Wechsler, RH; Zuntz, J; Abbott, TMC; Abdalla, FB; Allam, S; Annis, J; Avila, S; Bridle, SL; Brooks, D; Burke, DL; Carnero Rosell, A; Carrasco Kind, M; Carretero, J; Castander, FJ; Crocce, M; Cunha, CE; D'Andrea, CB; da Costa, LN; Davis, C; De Vicente, J; Diehl, HT; Doel, P; Drlica-Wagner, A; Evrard, AE; Flaugher, B; Fosalba, P; Frieman, J; García-Bellido, J; Gaztanaga, E; Gerdes, DW; Giannantonio, T; Gruendl, RA; Gutierrez, G; Honscheid, K; James, DJ; Kirk, D; Krause, E; Kuehn, K; Lahav, O; Li, TS; Lima, M; March, M; Marshall, JL; Menanteau, F; Miquel, R; Mohr, JJ; Nord, B; Ogando, RLC; Roodman, A; Sanchez, E; Scarpine, V; Schindler, R; Sevilla-Noarbe, I; Smith, M; Smith, RC; Sobreira, F; Suchyta, E; Swanson, MEC; Tarle, G; Tucker, DL; Vikram, V

Published Date

  • January 1, 2019

Published In

Volume / Issue

  • 482 / 1

Start / End Page

  • 1352 - 1378

Electronic International Standard Serial Number (EISSN)

  • 1365-2966

International Standard Serial Number (ISSN)

  • 0035-8711

Digital Object Identifier (DOI)

  • 10.1093/mnras/sty2711

Citation Source

  • Scopus