Weak lensing measurement of the mass-richness relation of SDSS redMaPPer clusters

Melanie Simet, Tom McClintock, Rachel Mandelbaum, Eduardo Rozo, Eli Rykoff, Erin Sheldon, Risa H. Wechsler

Research output: Contribution to journalArticlepeer-review

126 Scopus citations


We perform a measurement of the mass-richness relation of the redMaPPer galaxy cluster catalogue using weak lensing data from the Sloan Digital Sky Survey (SDSS). We have carefully characterized a broad range of systematic uncertainties, including shear calibration errors, photo-z biases, dilution by member galaxies, source obscuration, magnification bias, incorrect assumptions about cluster mass profiles, cluster centring, halo triaxiality and projection effects. We also compare measurements of the lensing signal from two independently produced shear and photometric redshift catalogues to characterize systematic errors in the lensing signal itself. Using a sample of 5570 clusters from 0.1 ≤ z ≤ 0.33, the normalization of our power-law mass versus λ relation is log10[M200m/h-1M] = 14.344 ± 0.021 (statistical) ±0.023 (systematic) at a richness λ=40, a 7 per cent calibration uncertainty, with a power-law index of 1.33-0.10+0.09 (1σ). The detailed systematics characterization in this work renders it the definitive weak lensing mass calibration for SDSS redMaPPer clusters at this time.

Original languageEnglish (US)
Pages (from-to)3103-3118
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Apr 21 2017


  • Galaxies: clusters: general
  • Gravitational lensing: weak

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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