Weak-lensing mass calibration of redMaPPer galaxy clusters in dark energy survey Science verification data

The DES Collaboration

Research output: Contribution to journalArticlepeer-review

106 Scopus citations

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 ≤ 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; clustermember 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)G. 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 (US)
Pages (from-to)4899-4920
Number of pages22
JournalMonthly Notices of the Royal Astronomical Society
Volume469
Issue number4
DOIs
StatePublished - 2017

Keywords

  • Cosmology
  • Galaxies: clusters: general
  • Gravitational lensing: weak
  • Observations

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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