Rozo, Eduardo and Wu, Hao-Yi and Fabian, Schmidt (2011) Stacked Weak Lensing Mass Calibration: Estimators, Systematics, and Impact on Cosmological Parameter Constraints. Astrophysical Journal, 735 (2). Art. No. 118. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20110712-102503918
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When extracting the weak lensing shear signal, one may employ either locally normalized or globally normalized shear estimators. The former is the standard approach when estimating cluster masses, while the latter is the more common method among peak finding efforts. While both approaches have identical signal-to-noise in the weak lensing limit, it is possible that higher order corrections or systematic considerations make one estimator preferable over the other. In this paper, we consider the efficacy of both estimators within the context of stacked weak lensing mass estimation in the Dark Energy Survey (DES). We find that the two estimators have nearly identical statistical precision, even after including higher order corrections, but that these corrections must be incorporated into the analysis to avoid observationally relevant biases in the recovered masses. We also demonstrate that finite bin-width effects may be significant if not properly accounted for, and that the two estimators exhibit different systematics, particularly with respect to contamination of the source catalog by foreground galaxies. Thus, the two estimators may be employed as a systematic cross-check of each other. Stacked weak lensing in the DES should allow for the mean mass of galaxy clusters to be calibrated to ≈2% precision (statistical only), which can improve the figure of merit of the DES cluster abundance experiment by a factor of ~3 relative to the self-calibration expectation. A companion paper investigates how the two types of estimators considered here impact weak lensing peak finding efforts.
|Additional Information:||© 2011 American Astronomical Society. Received 2010 September 14; accepted 2011 April 11; published 2011 June 24. E.R. thanks Mike Jarvis, Matthew Becker, Jörg Dietrich, Scott Dodelson, Henk Hoekstra, Anja von der Linden, and Raul Jimenez for helpful discussions. The authors also thank Josh Frieman and Jörg Dietrich for comments on an earlier version of this manuscript which helped to significantly improve the presentation. E.R. is funded by NASA through the Einstein Fellowship Program, grant PF9-00068. H.W. is supported by the Gabilan Stanford Graduate Fellowship and the SLAC National Accelerator Laboratory. F.S. is supported by the Gordon and Betty Moore Foundation at Caltech.|
|Subject Keywords:||cosmology: miscellaneous; galaxies: clusters: general|
|Classification Code:||PACS: 98.65.Cw; 98.62.Sb; 98.80.Cq; 95.36.+x|
|Official Citation:||Stacked Weak Lensing Mass Calibration: Estimators, Systematics, and Impact on Cosmological Parameter Constraints Eduardo Rozo et al. 2011 ApJ 735 118|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||12 Jul 2011 18:40|
|Last Modified:||26 Dec 2012 13:23|
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