Leauthaud, A., Finoguenov, A., Kneib, J. P., Taylor, J. E., Massey, R., Rhodes, J., ...
Measurements of X-ray scaling laws are critical for improving cosmological constraints derived with the halo mass function and for understanding the physical processes that govern the heating and...
Shear and Magnification: Cosmic Complementarity (2009)
The potential of cosmic shear to probe cosmology is well recognized and future optical wide field surveys are currently being designed to optimize the return of cosmic shear science. High precision...
Hildebrandt, H., Van Waerbeke, L., Erben, T.
Weak gravitational lensing (WL) has been established as one of the most promising probes of cosmology. So far, most studies have exploited the shear effect of WL leading to coherent distortions of...
Breaking the Degeneracy: Optimal Use of Three-point Weak Lensing Statistics (2009)
Vafaei, S., Lu, T., Van Waerbeke, L., Semboloni, E., Heymans, C., Pen, U. L.
We study the optimal use of third order statistics in the analysis of weak lensing by large-scale structure. These higher order statistics have long been advocated as a powerful tool to break...
Hildebrandt, H., Pielorz, J., Erben, T., Van Waerbeke, L., Simon, P., Capak, P.
Aims. We measure the clustering properties for a large samples of u- (z ~ 3), g- (z ~ 4), and r- (z ~ 5) dropouts from the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) Deep fields. Methods....
Hildebrandt, H., Pielorz, J., Erben, T., Van Waerbeke, L., Simon, P., Capak, P.
Aims: We measure the clustering properties for a large samples of u- (z~3), g- (z~4), and r- (z~5) dropouts from the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS) Deep fields. Methods:...
Erben, T., Hildebrandt, H., Lerchster, M., Hudelot, P., Benjamin, J., Van Waerbeke, L., ...
We present the CFHTLS-Archive-Research Survey (CARS). It is a virtual multi-colour survey based on public archive images from the CFHT-Legacy-Survey. Our main scientific interests in CARS are optical...
Bayesian Galaxy Shape Measurement for Weak Lensing Surveys -II. Application to Simulations (2008)
Kitching, T. D., Miller, L., Heymans, C. E., Van Waerbeke, L., Heavens, A. F.
We extend the Bayesian model fitting shape measurement method presented in Miller et al. (2007) and use the method to estimate the shear from the Shear TEsting Programme simulations (STEP). The...
Very weak lensing in the CFHTLS Wide: Cosmology from cosmic shear in the linear regime (2007)
Fu, L., Semboloni, E., Hoekstra, H., Kilbinger, M., Van Waerbeke, L., Tereno, I., ...
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 on the scaling of...
Miller, L., Kitching, T. D., Heymans, C., Heavens, A. F., Van Waerbeke, L.
The principles of measuring the shapes of galaxies by a model-fitting approach are discussed in the context of shape-measurement for surveys of weak gravitational lensing. It is argued that such an...
The SCUBA-2 "All-Sky" Survey (2007)
Thompson, M. A., Serjeant, S., Jenness, T., Scott, D., Ashdown, M., Brunt, C., ...
The sub-millimetre wavelength regime is perhaps the most poorly explored over large areas of the sky, despite the considerable effort that has been expended in making deep maps over small regions. As...
Weak Gravitational Lensing with COSMOS: Galaxy Selection and Shape Measurements (2007)
Leauthaud, A., Massey, R., Kneib, J. P., Rhodes, J., Johnston, D. E., Capak, P., ...
With a primary goal of conducting precision weak lensing measurements from space, the COSMOS survey has imaged the largest contiguous area observed by the Hubble Space Telescope (HST) to date using...
Weak Gravitational Lensing with COSMOS: Galaxy Selection and Shape Measurements (2007)
Leauthaud, A., Massey, R., Kneib, J. P., Rhodes, J., Johnston, D. E., Capak, P., ...
With a primary goal of conducting precision weak lensing measurements from space, the COSMOS survey has imaged the largest contiguous area observed by the Hubble Space Telescope (HST) to date using...
COSMOS: Hubble space telescope observations (2007)
Scoville, N., Abraham, R. G., Aussel, H., Barnes, J. E., Benson, A., Blain, A. W., ...
COSMOS: Hubble Space Telescope observations (2007)
Scoville, N., Abraham, R. G., Aussel, H., Barnes, J. E., Benson, A., Blain, A. W., ...
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. Here we review the...
Cosmology with Weak Lensing Surveys (2006)
Munshi, D., Valageas, P., Van Waerbeke, L., Heavens, A.
Weak gravitational lensing is responsible for the shearing and magnification of the images of high-redshift sources due to the presence of intervening matter. The distortions are due to fluctuations...
COSMOS : Hubble Space Telescope Observations (2006)
Scoville, N., Benson, A., Blain, A. W., Calzetti, D., Comastri, A., Capak, P., ...
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. Here we review the...
The Shear Testing Programme - I. Weak lensing analysis of simulated ground-based observations (2006)
Heymans, C., Van Waerbeke, L., Bacon, D., Berge, J., Bernstein, G., Bertin, E., ...
The Shear Testing Programme (STEP) is a collaborative project to improve the accuracy and reliability of all weak lensing measurements in preparation for the next generation of wide-field surveys. In...
Hoekstra, H., Mellier, Y., Van Waerbeke, L., Semboloni, E., Fu, L., Hudson, M. J., ...
We present the first measurements of the weak gravitational lensing signal induced by the large scale mass distribution from data obtained as part of the ongoing Canada-France-Hawaii Telescope Legacy...
Cosmic Shear Analysis with CFHTLS Deep data (2005)
Semboloni, E., Mellier, Y., Van Waerbeke, L., Hoekstra, H., Tereno, I., Benabed, K., ...
We present the first cosmic shear measurements obtained from the T0001 release of the Canada-France-Hawaii Telescope Legacy Survey. The data set covers three uncorrelated patches (D1, D3 and D4) of...
Detection of non-Gaussian Signatures in the VIRMOS-DESCART Lensing Survey (2005)
Bernardeau, F., Mellier, Y., Van Waerbeke, L.
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 by Bernardeau et...
Patterns in the weak shear 3-point correlation function (2005)
Bernardeau, F., Van Waerbeke, L., Mellier, Y.
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 convergence field,...
Cross-correlating CMB polarization with local large scale structures (2005)
Benabed, K., Bernardeau, F., Van Waerbeke, L.
We study heterogeneous quantities that efficiently cross-correlate the lensing information encoded in CMB polarization and large-scale structures recovered from weak lensing galaxy surveys. These...
CMB B-polarization to map the Large-scale Structures of the Universe (2005)
Benabed, K., Bernardeau, F., Van Waerbeke, L.
We explore the possibility of using the B-type polarization of the CMB to map the large-scale structures of the Universe taking advantage of the lens effects on the CMB polarization. The functional...
Searching for galaxy clusters using the aperture mass statistics in 50 VLT fields (2005)
Hetterscheidt, M., Erben, T., Schneider, P., Maoli, R., Van Waerbeke, L., Mellier, Y.
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 and maximise the...
Dealing with systematics in cosmic shear studies: new results from the VIRMOS-Descart Survey (2004)
Van Waerbeke, L., Mellier, Y., Hoekstra, H.
We present a reanalysis of the VIRMOS-Descart weak lensing data, with a particular focus on different corrections for the variation of the point spread function anisotropy (PSF) across the CCDs. We...
Joint cosmological parameters forecast from CFHTLS-cosmic shear and CMB data (2004)
Tereno, I., Doré, O., Van Waerbeke, L., Mellier, Y.
We present a prospective analysis of a combined cosmic shear and cosmic microwave background data set, focusing on a Canada France Hawaii Telescope Legacy Survey (CFHTLS) type lensing survey and the...
Gravitational Lensing by Large Scale Structures: A Review (2003)
We review all the cosmic shear results obtained so far, with a critical discussion of the present strengths and weaknesses. We discuss the future prospects and the role cosmic shear could play in a...
Van Waerbeke, L., Tereno, I., Mellier, Y., Bernardeau, F.
We present an overview of the cosmic shear results obtained so far. We focus on the 2-point statistics only. Evidences supporting the cosmological origin of the measured signal are reviewed, and...
Wide-field cosmic shear surveys (2002)
Mellier, Y., Van Waerbeke, L., Bertin, E., Tereno, I., Bernardeau, F.
We present the current status of cosmic shear based on all surveys done so far. Taken together, they cover more about 70 deg$^2$ and concern more than 3 million galaxies with accurate shape...
Prospects for weak lensing/cosmic shear with VLTs (2002)
Mellier, Y., Van Waerbeke, L., Bertin, E., Tereno, I., Schneider, P., Bernardeau, F., ...
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 present-day and future...
Cosmological Weak Lensing (2002)
Mellier, Y., Van Waerbeke, L., Bernardeau, F., Tereno, I.
We present the current status of cosmic shear studies and their implications on cosmological models. Theoretical expectations and observational results are discussed in the framework of standard...
Cosmic Shear: The Dark Side of the Universe (2002)
Van Waerbeke, L., Mellier, Y., Tereno, I.
We discuss the present status and future prospects for cosmic shear observations and their cosmological constraints. We review the evidences supporting the cosmological origin of the measured signal,...
Likelihood Analysis of Cosmic Shear on Simulated and VIRMOS-DESCART Data (2002)
Van Waerbeke, L., Mellier, Y., Pello, R., Pen, U-L., McCracken, H. J., Jain, B.
We present a maximum likelihood analysis of cosmological parameters from measurements of the aperture mass up to 35 arcmin, using simulated and real cosmic shear data. A four-dimensional parameter...
Patterns in the weak shear 3-point correlation function (2002)
Bernardeau, F., Van Waerbeke, L., Mellier, Y.
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 convergence field,...
Detection of non-Gaussian Signatures in the VIRMOS-DESCART Lensing Survey (2002)
Bernardeau, F., Mellier, Y., Van Waerbeke, L.
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 by Bernardeau et...
Detection of non-Gaussian Signatures in the VIRMOS-DESCART Lensing Survey (2002)
Bernardeau, F., Mellier, Y., Van Waerbeke, L.
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 by Bernardeau et...
Patterns in the weak shear 3-point correlation function (2002)
Bernardeau, F., Van Waerbeke, L., Mellier, Y.
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 convergence field,...
Detection of non-Gaussian Signatures in the VIRMOS-DESCART Lensing Survey (2002)
Bernardeau, F., Mellier, Y., Van Waerbeke, L.
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 by Bernardeau et...
Patterns in the weak shear 3-point correlation function (2002)
Bernardeau, F., Van Waerbeke, L., Mellier, Y.
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 convergence field,...
Analysis of two-point statistics of cosmic shear - I. Estimators and covariances (2002)
Schneider, P., Van Waerbeke, L., Kilbinger, M., Mellier, Y.
Recently, cosmic shear, the weak lensing effect by the inhomogeneous matter distribution in the Universe, has not only been detected by several groups, but the observational results have been used to...
B-modes in cosmic shear from source redshift clustering (2002)
Schneider, P., Van Waerbeke, L., Mellier, Y.
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 detection of...
B-modes in cosmic shear from source redshift clustering (2001)
Schneider, P., Van Waerbeke, L., Mellier, Y.
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 detection of...
Tracing Matter with Weak Lensing Surveys (2001)
Gravitational weak lensing maps the location of (dark) matter at all scales. The lens-induced distortion field traces gravity fields and can be used to reconstruct the mass distribution in galaxies,...
Cosmic Shear Statistics and Cosmology (2001)
Van Waerbeke, L., Mellier, Y., Radovich, M., Bertin, E., Dantel-Fort, M., McCracken, H. J., ...
We report a measurement of cosmic shear correlations using an effective area of 6.5 sq. deg. of the VIRMOS deep imaging survey in progress at the Canada-France-Hawaii Telescope. We measured various...
Mellier, Y., Van Waerbeke, L., Maoli, R., Schneider, P., Jain, B., Bernardeau, F., ...
Gravitational weak shear produced by large-scale structures of the universe induces a correlated ellipticity distribution of distant galaxies. The amplitude and evolution with angular scale of the...
Terapixel Surveys for Cosmic Shear (2000)
Mellier, Y., Van Waerbeke, L., Radovich, M., Bertin, E., Dantel-Fort, M., ...
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 for cosmology....
Cosmic Shear Analysis in 50 Uncorrelated VLT Fields. Implications for Omega_0, sigma_8 (2000)
Maoli, R., Van Waerbeke, L., Mellier, Y., Schneider, P., Jain, B., Bernardeau, F., ...
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 arc-minutes. The...
Cosmic Shear and Clusters of Galaxies (2000)
Mellier, Y., Van Waerbeke, L., Erben, T., Schneider, P., Bernardeau, F., Jain, B., ...
The first detections of cosmic shear signal reported recently by 4 independent groups cover angular scales between one and 10 arcmin. On those scales, the cosmic shear is a signature of non-linear...
Weak Lensing Predictions at Intermediate Scales (2000)
Van Waerbeke, L., Hamana, T., Scoccimarro, R., Colombi, S., Bernardeau, F.
As pointed out in previous studies, the measurement of the skewness of the convergence field $\kappa$ will be useful in breaking the degeneracy among the cosmological parameters constrained from weak...
Cosmic Shear with the CFHT (2000)
Van Waerbeke, L., Mellier, Y., Erben, T., Bernardeau, F., Maoli, R., ...
We present results of our cosmic shear survey in progress at the Canada- France-Hawaii Telescope (CFHT). We analysed 1.7 sq. degrees of data, out of which we measured a significant correlation of...
Cosmic Shear with the VLT (2000)
Maoli, R., Mellier, Y., Van Waerbeke, L., Schneider, P., Jain, B., Erben, T., ...
We report on the detection of cosmic shear on angular scales of 1.3-6.5 arcmin using 45 independent empty fields observed with the Very Large Telescope (VLT). This result confirms previous...
A Numerical Study of Cosmic Shear Statistics (2000)
Thion, A., Mellier, Y., Bernardeau, F., Bertin, E., Erben, T., Van Waerbeke, L.
We explore the stability of the variance and skewness of the cosmic gravitational convergence field, using two different approaches: first we simulate a whole MEGACAM survey (100 sq. degrees). The...
Cross-correlating CMB polarization with local large scale structures (2000)
Benabed, K., Bernardeau, F., Van Waerbeke, L.
We study heterogeneous quantities that efficiently cross-correlate the lensing information encoded in CMB polarization and large-scale structures recovered from weak lensing galaxy surveys. These...
CMB B-polarization to map the Large-scale Structures of the Universe (2000)
Benabed, K., Bernardeau, F., Van Waerbeke, L.
We explore the possibility of using the B-type polarization of the CMB to map the large-scale structures of the Universe taking advantage of the lens effects on the CMB polarization. The functional...
Van Waerbeke, L., Mellier, Y., Erben, T., Cuillandre, J. C., Bernardeau, F., Maoli, R., ...
We report the detection of a significant (5.5 sigma) excess of correlations between galaxy ellipticities at scales ranging from 0.5 to 3.5 arc-minutes. This detection of a gravitational lensing...
Cross-correlating CMB polarization with local large scale structures (2000)
Benabed, K., Bernardeau, F., Van Waerbeke, L.
We study heterogeneous quantities that efficiently cross-correlate the lensing information encoded in CMB polarization and large-scale structures recovered from weak lensing galaxy surveys. These...
CMB B-polarization to map the Large-scale Structures of the Universe (2000)
Benabed, K., Bernardeau, F., Van Waerbeke, L.
We explore the possibility of using the B-type polarization of the CMB to map the large-scale structures of the Universe taking advantage of the lens effects on the CMB polarization. The functional...
Cross-correlating CMB polarization with local large scale structures (2000)
Benabed, K., Bernardeau, F., Van Waerbeke, L.
We study heterogeneous quantities that efficiently cross-correlate the lensing information encoded in CMB polarization and large-scale structures recovered from weak lensing galaxy surveys. These...
CMB B-polarization to map the Large-scale Structures of the Universe (2000)
Benabed, K., Bernardeau, F., Van Waerbeke, L.
We explore the possibility of using the B-type polarization of the CMB to map the large-scale structures of the Universe taking advantage of the lens effects on the CMB polarization. The functional...
Van Waerbeke, L., Bernardeau, F., Benabed, K.
The low redshift structures of the Universe act as lenses in a similar way on the Cosmic Microwave Background light and on the distant galaxies (say at redshift about unity). As a consequence, the...
Weak lensing analysis of MS 1008-1224 with the VLT (1999)
Athreya, R., Mellier, Y., Van Waerbeke, L., Fort, B., Pello, R., Dantel-Fort, M.
We present a gravitational lensing analysis of the cluster of galaxies MS 1008-1224 (z=0.30), based on very deep observations obtained using the VLT with FORS and ISAAC during the science...
Noise properties of gravitational lens mass reconstruction (1999)
Gravitational lensing is potentially able to observe mass-selected halos, and to measure the projected cluster mass function. An optimal mass-selection requires a quantitative understanding of the...
Erben, T., Van Waerbeke, L., Mellier, Y., Schneider, P., Castander, F. J., ...
A weak-lensing analysis of wide-field $V$- and $I$-band images centered on the cluster Abell 1942 has uncovered a mass concentration $\sim 7$ arcminutes South of the cluster center. A statistical...
Measuring galaxy biasing with gravitational weak lensing (1998)
Gravitational weak lensing by large scale structures is view as a tool to probe the bias relation between the mass and the light distributions. It is explained how a particular statistic can be used...
Efficiency of weak lensing surveys to probe cosmological models (1998)
Van Waerbeke, L., Bernardeau, F., Mellier, Y.
We apply a mass reconstruction technique to simulated large-scale structure gravitational distortion maps, from 2.5' to 10 degree scales, for different cosmological scenarii. The projected mass is...
Dark Matter and Gravitational Lensing (1998)
Mellier, Y., Bernardeau, F., Van Waerbeke, L.
The last decade has shown a considerable development of gravitational lensing for cosmology because it probes the amount and the nature of dark matter, and provides information on the density...
Detection of shear due to weak lensing by large-scale structure (1997)
Schneider, P., Van Waerbeke, L., Mellier, Y., Jain, B., Seitz, S., Fort, B.
We present evidence for a coherent shear signal in a field containing the z=1.2 radio-source PKS1508-05. Since there were no intervening mass concentrations known before targeting this field, we...
Recent Advances in Gravitational Lensing (1996)
Mellier, Y., Van Waerbeke, L., Bernardeau, F., Fort, B.
The gravitational lensing effect is one of the most promising tools for cosmology. Indeed it probes directly the total mass distribution in large-scale structures and can as well provide valuable...
Weak Lensing Statistics as a Probe of Omega and Power Spectrum (1996)
Bernardeau, F., Van Waerbeke, L., Mellier, Y.
The possibility of detecting weak lensing effects from deep wide field imaging surveys has open new means of probing the large-scale structures of the Universe and measuring cosmological parameters....
Weak Lensing as a Probe of Dark Matter (1996)
Weak gravitational lensing of distant galaxies can probe the total projected mass distribution of foreground gravitational structures on all scales and has been used successfully to map the projected...
Van Waerbeke, L., Mellier, Y., Schneider, P., Fort, B., Mathez, G.
A new method for measuring the shear induced by gravitational light deflection is proposed. It is based on analyzing the anisotropy induced in the auto-correlation function (ACF) of the extragalactic...
V/Vmax statistic and Neo-Classic Cosmological Tests (1995)
Van Waerbeke, L., Mathez, G., Mellier, Y., Bonnet, H., Lachieze-Rey, M.
A new cosmological test is derived, based on the distribution of individual V/Vmax in a complete redshift-limited sample of distant objects. The fundamental assumption is that, in any bin of absolute...
Mathez, G., Van Waerbeke, L., Mellier, Y., Bonnet, H., Lachieze-Rey, M.
This paper describes the simulation of realistic Monte-Carlo extragalactic catalogues, aimed at comparing the behaviour of cosmological tests versus input parameters. QSO catalogues are built on a...