Dark Energy Survey Year 1 Results: Weak Lensing Mass Calibration of redMaPPer Galaxy Clusters

McClintock, T. and Varga, T.~N. and Gruen, D. and Rozo, E. and Rykoff, E.~S. and Shin, T. and Melchior, P. and DeRose, J. and Seitz, S. and Dietrich, J.~P. and Sheldon, E. and Zhang, Y. and von der Linden, A. and Jeltema, T. and Mantz, A. and Romer, A.~K. and Allen, S. and Becker, M.~R. and Bermeo, A. and Bhargava, S. and Costanzi, M. and Everett, S. and Farahi, A. and Hamaus, N. and Hartley, W.~G. and Hollowood, D.~L. and Hoyle, B. and Israel, H. and Li, P. and MacCrann, N. and Morris, G. and Palmese, A. and Plazas, A.~A. and Pollina, G. and Rau, M.~M. and Simet, M. and Soares-Santos, M. and Troxel, M.~A. and Vergara Cervantes, C. and Wechsler, R.~H. and Zuntz, J. and Abbott, T.~M.~C. and Abdalla, F.~B. and Allam, S. and Annis, J. and Avila, S. and Bridle, S.~L. and Brooks, D. and Burke, D.~L. and Carnero Rosell, A. and Carrasco Kind, M. and Carretero, J. and Castander, F.~J. and Crocce, M. and Cunha, C.~E. and D_s14Andrea, C.~B. and da Costa, L.~N. and Davis, C. and De Vicente, J. and Diehl, H.~T. and Doel, P. and Drlica-Wagner, A. and Evrard, A.~E. and Flaugher, B. and Fosalba, P. and Frieman, J. and Garc_s14ia-Bellido, J. and Gaztanaga, E. and Gerdes, D.~W. and Giannantonio, T. and Gruendl, R.~A. and Gutierrez, G. and Honscheid, K. and James, D.~J. and Kirk, D. and Krause, E. and Kuehn, K. and Lahav, O. and Li, T.~S. and Lima, M. and March, M. and Marshall, J.~L. and Menanteau, F. and Miquel, R. and Mohr, J.~J. and Nord, B. and Ogando, R.~L.~C. and Roodman, A. and Sanchez, E. and Scarpine, V. and Schindler, R. and Sevilla-Noarbe, I. and Smith, M. and Smith, R.~C. and Sobreira, F. and Suchyta, E. and Swanson, M.~E.~C. and Tarle, G. and Tucker, D.~L. and Vikram, V. and Walker, A.~R. and Weller, J.

Keywords

Astrophysics - Cosmology and Nongalactic Astrophysics

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 $4times3$ bins of richness $lambda$ and redshift $z$ for $lambdageq20$ and $0.2 leq z leq 0.65$ and measure the mean masses of these bins using their stacked weak lensing signal. By modeling the scaling relation as $langle M_{rm 200m}|lambda,zrangle = M_0 (lambda/40)^F ((1_s16z)/1.35)^G$, we constrain the normalization of the scaling relation at the 5.0 per cent level as $M_0 = [3.081 pm 0.075 ({rm stat}) pm 0.133 ({rm sys})] cdot 10^{14} {rm M}_odot$ at $lambda=40$ and $z=0.35$. The richness scaling index is constrained to be $F=1.356 pm 0.051 ({rm stat})pm 0.008 ({rm sys})$ and the redshift scaling index $G=-0.30pm 0.30 ({rm stat})pm 0.06 ({rm sys})$. 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.

Dark Energy Survey Year 1 Results: Weak Lensing Mass Calibration of redMaPPer Galaxy Clusters

Keywords

Abstract

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