Deep lensing with a twist: E and B modes in a field with multiple lenses
arXiv:1709.09721 · doi:10.1093/mnras/sty2782
Abstract
We explore the weak lensing E- and B-mode shear signals of a field of galaxy clusters using both large scale structure N-body simulations and multi-color Suprime-cam & Hubble Space Telescope observations. Using the ray-traced and observed shears along with photometric redshift catalogs, we generate mass maps of the foreground overdensities by optimally filtering the tangential shear that they induce on background galaxies. We then develop and test a method to approximate the foreground structure as a superposition of NFW-like halos by locating these overdensities and determining their mass and redshift, thereby modeling the background correlated shear field as a sum of lensings induced by the foreground clusters. We demonstrate that the B-mode maps and shear correlation functions, which are generated by similarly filtering the cross shear in this method, are in agreement with observations and are related to the estimated cluster masses and locations as well as the distribution of background sources. Using the foreground mass model, we identify several sources of weak lensing B-modes including leakage and edge effects, source clustering, and multiple lensing which can be observed in deep cosmic shear surveys.
15 pages, 13 figures. Accepted to MNRAS
References in corpus (11)
- Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
- Subaru Deep Survey V. A Census of Lyman Break Galaxies at z=4 and 5 in the Subaru Deep Fields: Photometric Properties
- The Canadian Cluster Comparison Project: detailed study of systematics and updated weak lensing masses
- Dark Energy Survey Year 1 Results: Weak Lensing Shape Catalogues
- CFHTLenS: Cosmological constraints from a combination of cosmic shear two-point and three-point correlations
- Principal Component Analysis of the Time- and Position-Dependent Point Spread Function of the Advanced Camera for Surveys
- KiDS-450: Cosmological Constraints from Weak Lensing Peak Statistics-I: Inference from Analytical Prediction of High Signal-to-Noise Ratio Convergence Peaks
- GaBoDS: The Garching-Bonn Deep Survey -- IX. A sample of 158 shear-selected mass concentration candidates
- A Subaru Weak Lensing Survey I: Cluster Candidates and Spectroscopic Verification
- Cosmology with the Large Synoptic Survey Telescope: an Overview
- A large sample of shear selected clusters from the Hyper Suprime-Cam Subaru Strategic Program S16A wide field mass maps