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

McClintock, T.; Varga, T. N.; Grün, D.; Rozo, E.; Rykoff, E. S.; Shin, T.; Melchior, P.; DeRose, J.; Seitz, S.; Dietrich, J. P.; Sheldon, E.; Zhang, Y.; von der Linden, A.; Jeltema, T.; Mantz, A. B.; Romer, A. K.; Allen, S.; Becker, M. R.; Bermeo, A.; Bhargava, S.; Costanzi, M.; Everett, S.; Farahi, A.; Hamaus, N.; Hartley, W. G.; Hollowood, D. L.; Hoyle, B.; Israel, H.; Li, P.; MacCrann, N.; Morris, G.; Palmese, A.; Plazas, A. A.; Pollina, G.; Rau, M. M.; Simet, M.; Soares-Santos, M.; Troxel, M. A.; Cervantes, C. Vergara; Wechsler, R. H.; Zuntz, J.; Abbott, T. M. C.; Abdalla, F. B.; Allam, S.; Annis, J.; Avila, S.; Bridle, S. L.; Brooks, D.; Burke, D. L.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Castander, F. J.; Crocce, M.; Cunha, C. E.; D'Andrea, C. B.; da Costa, L. N.; Davis, C.; De Vicente, J.; Diehl, H. T.; Doel, P.; Drlica-Wagner, A.; Evrard, A. E.; Flaugher, B.; Fosalba, P.; Frieman, J.; Garcia-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Giannantonio, T.; Gründl, R. A.; Gutierrez, G.; Honscheid, K.; James, D. J.; Kirk, D.; Krause, E.; Kühn, K.; Lahav, O.; Li, T. S.; Lima, M.; March, M.; Marshall, J. L.; Menanteau, F.; Miquel, R.; Mohr, J. J.; Nord, B.; Ogando, R. L. C.; Roodman, A.; Sanchez, E.; Scarpine, V.; Schindler, R.; Sevilla-Noarbe, I.; Smith, M.; Smith, R. C.; Sobreira, F.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Tucker, D. L.; Vikram, V.; Walker, A. R. und Weller, Jochen (2019): Dark Energy Survey Year 1 results: weak lensing mass calibration of redMaPPer galaxy clusters. In: Monthly Notices of the Royal Astronomical Society, Bd. 482, Nr. 1: S. 1352-1378

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 4 x 3 bins of richness lambda and redshift z for lambda >= 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 M-200m|lambda, M-0(lambda/40)(F)((1 + /1.35)(G), we constrain the normalization of the scaling relation at the 5.0 per cent level, finding M-0 = [3.081 +/- 0.075(stat) +/- 0.133(sys)] center dot 10(14) M-aS (TM) at lambda = 40 and = 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 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.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik > Astronomie und Astrophysik, Kosmologie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0035-8711
• Sprache: Englisch