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Mass Calibration of Optically Selected DES clusters using a Measurement of CMB-Cluster Lensing with SPTpol Data

  • Raghunathan, S.
  • Patil, S.
  • Baxter, E.
  • Benson, B. A.
  • Bleem, L. E.
  • Chou, T. L.
  • Crawford, T. M.
  • Holder, G. P.
  • McClintock, T.
  • Reichardt, C. L.
  • Rozo, E.
  • Varga, T. N.
  • Abbott, T. M. C.
  • Ade, P. A. R.
  • Allam, S.
  • Anderson, A. J.
  • Annis, J.
  • Austermann, J. E.
  • Avila, S.
  • Beall, J. A.
  • And 112 more
Publication Date
Feb 20, 2019
Submission Date
Oct 25, 2018
DOI: 10.3847/1538-4357/ab01ca
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We use cosmic microwave background (CMB) temperature maps from the 500 deg$^{2}$ SPTpol survey to measure the stacked lensing convergence of galaxy clusters from the Dark Energy Survey (DES) Year-3 redMaPPer (RM) cluster catalog. The lensing signal is extracted through a modified quadratic estimator designed to be unbiased by the thermal Sunyaev-Zel{'}dovich (tSZ) effect. The modified estimator uses a tSZ-free map, constructed from the SPTpol 95 and 150 GHz datasets, to estimate the background CMB gradient. For lensing reconstruction, we employ two versions of the RM catalog: a flux-limited sample containing 4003 clusters and a volume-limited sample with 1741 clusters. We detect lensing at a significance of 8.7$\sigma$(6.7$\sigma$) with the flux(volume)-limited sample. By modeling the reconstructed convergence using the Navarro-Frenk-White profile, we find the average lensing masses to be $M_{200m}$ = ($1.62^{+0.32}_{-0.25}$ [stat.] $\pm$ 0.04 [sys.]) and ($1.28^{+0.14}_{-0.18}$ [stat.] $\pm$ 0.03 [sys.]) $\times\ 10^{14}\ M_{\odot}$ for the volume- and flux-limited samples respectively. The systematic error budget is much smaller than the statistical uncertainty and is dominated by the uncertainties in the RM cluster centroids. We use the volume-limited sample to calibrate the normalization of the mass-richness scaling relation, and find a result consistent with the galaxy weak-lensing measurements from DES (Mcclintock et al. 2018).

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