648 citations · 10.1k across the 116 of their papers we have counts for
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Sources of contamination to weak lensing tomography: redshift-dependent shear measurement bias
Elisabetta Semboloni, Ismael Tereno, Ludovic van Waerbeke +1
The current methods available to estimate gravitational shear from astronomical images of galaxies introduce systematic errors which can affect the accuracy of weak lensing cosmolo…
Sersiclets - A Matched Filter Extension of Shapelets for Weak Lensing Studies
Wai-Hin Wayne Ngan, Ludovic Van Waerbeke, Andisheh Mahdavi +2
The precision study of dark matter using weak lensing by large scale structure is strongly constrained by the accuracy with which one can measure galaxy shapes. Several methods hav…
Very weak lensing in the CFHTLS Wide: Cosmology from cosmic shear in the linear regime
L. Fu, E. Semboloni, H. Hoekstra +16
We present an exploration of weak lensing by large-scale structure in the linear regime, using the third-year (T0003) CFHTLS Wide data release. Our results place tight constraints…
The Masses and Shapes of Dark Matter Halos from Galaxy-Galaxy Lensing in the CFHTLS
Laura C. Parker, Henk Hoekstra, Michael J. Hudson +2
We present the first galaxy-galaxy weak lensing results using early data from the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS). These results are based on ~22 sq. deg. of…
Cosmological Constraints From the 100 Square Degree Weak Lensing Survey
Jonathan Benjamin, Catherine Heymans, Elisabetta Semboloni +7
We present a cosmic shear analysis of the 100 square degree weak lensing survey, combining data from the CFHTLS-Wide, RCS, VIRMOS-DESCART and GaBoDS surveys. Spanning ~100 square d…
The Stability of the Point Spread Function of the Advanced Camera for Surveys on the Hubble Space Telescope and Implications for Weak Gravitational Lensing
Jason D. Rhodes, Richard Massey, Justin Albert +11
(abridged) We examine the spatial and temporal stability of the HST ACS Wide Field Camera (WFC) point spread function (PSF) using the two square degree COSMOS survey. We show that…
COSMOS: 3D weak lensing and the growth of structure
Richard Massey, Jason Rhodes, Alexie Leauthaud +17
We present a three dimensional cosmic shear analysis of the Hubble Space Telescope COSMOS survey, the largest ever optical imaging program performed in space. We have measured the…
COSMOS : Hubble Space Telescope Observations
N. Scoville, A. Benson, A. W. Blain +50
The Cosmic Evolution Survey (COSMOS) was initiated with an extensive allocation (590 orbits in Cycles 12-13) using the Hubble Space Telescope (HST) for high resolution imaging. Her…
Searching for galaxy clusters using the aperture mass statistics in 50 VLT fields
M. Hetterscheidt, T. Erben, P. Schneider +3
Application of the aperture mass (Map-) statistics provides a weak lensing method for the detection of cluster-sized dark matter halos. We present a new aperture filter function an…
Large scale systematic signals in weak lensing surveys
Chris Vale, Henk Hoekstra, Ludovic van Waerbeke +1
We use numerical simulations to model the effect of seeing and extinction modulations on weak lensing surveys. We find that systematic fluctuations in the shear amplitude and sourc…
Detection of dark matter Skewness in the VIRMOS-DESCART survey: Implications for Ω_0
Ue-Li Pen, Tongjie Zhang, Ludovic van Waerbeke +3
Weak gravitational lensing provides a direct statistical measure of the dark matter distribution. The variance is easiest to measure, which constrains the degenerate product σ_8Ω^0…
Prospects for weak lensing/cosmic shear with VLTs
Y. Mellier, L. van Waerbeke, E. Bertin +4
The present status of weak lensing analyses of clusters of galaxies and of cosmic shear surveys are presented and discussed. We focus on the impact of very large telescopes on pres…
Cosmological Weak Lensing
Y. Mellier, L. van Waerbeke, F. Bernardeau +1
We present the current status of cosmic shear studies and their implications on cosmological models. Theoretical expectations and observational results are discussed in the framewo…
Analysis of two-point statistics of cosmic shear: I. Estimators and covariances
Peter Schneider, Ludovic van Waerbeke, Martin Kilbinger +1
We derive in this paper expressions for the covariance matrix of the cosmic shear two-point correlation functions which are readily applied to any survey geometry. Furthermore, we…
Weak lensing study of galaxy biasing
Henk Hoekstra, Ludo van Waerbeke, Michael D. Gladders +2
We combine weak lensing measurements from the Red-Sequence Cluster Survey and the VIRMOS-DESCART survey, and present the first direct measurements of the bias parameter b and the g…
Detection of non-Gaussian Signatures in the VIRMOS-DESCART Lensing Survey
F. Bernardeau, Y. Mellier, L. van Waerbeke
We have detected non-Gaussian signatures in the VIRMOS-DESCART weak lensing survey from a measurement of the three-point shear correlation function, following the method developed…
Patterns in the weak shear 3-point correlation function
F. Bernardeau, L. van Waerbeke, Y. Mellier
We explore the scale and angular dependence of the cosmic shear three-point correlation function. The shear field is found to have a much more complex three-point function than the…
B-modes in cosmic shear from source redshift clustering
P. Schneider, L. van Waerbeke, Y. Mellier
Weak gravitational lensing by the large scale structure can be used to probe the dark matter distribution in the Universe directly and thus to probe cosmological models. The recent…
Completeness in Weak Lensing Searches for Clusters
Martin White, Ludovic van Waerbeke, Jonathan Mackey
Using mock observations of numerical simulations, we investigate the completeness and efficiency of searches for galaxy clusters in weak lensing surveys. While it is possible to se…
Gravity and Non-gravity Modes in the VIRMOS-DESCART Weak Lensing Survey
Ue-Li Pen, Ludovic van Waerbeke, Yannick Mellier
We analyze the weak lensing data of the VIRMOS imaging survey using projections (called E and B-modes) of the two independents observed correlation functions. The E-mode contains a…
Cosmic shear surveys
Y. Mellier, L. van Waerbeke, R. Maoli +6
Gravitational weak shear produced by large-scale structures of the universe induces a correlated ellipticity distribution of distant galaxies. The amplitude and evolution with angu…
Terapixel Surveys for Cosmic Shear
Y. Mellier, L. van Waerbeke, M. Radovich +14
The recent detections of cosmic shear signal announced by several groups have demonstrated the feasibility of this challenging program and convinced astro- nomers of its potential…
Cosmic Shear Analysis in 50 Uncorrelated VLT Fields. Implications for Omega_0, sigma_8
R. Maoli, L. Van Waerbeke, Y. Mellier +5
We observed with the camera FORS1 on the VLT (UT1, ANTU) 50 randomly selected fields and analyzed the cosmic shear inside circular apertures with diameter ranging from 0.5 to 5.0 a…
Weak Lensing Predictions at Intermediate Scales
L. Van Waerbeke, T. Hamana, R. Scoccimarro +2
As pointed out in previous studies, the measurement of the skewness of the convergence field will be useful in breaking the degeneracy among the cosmological parameters constra…