6 papers
Cosmic Shear with the CFHT
L. van Waerbeke, Y. Mellier, T. Erben +10
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…
Spectroscopic follow up of arclets in AC114 with the VLT
J. F. Le Borgne, L. Campusano, R. Pello +5
We present the first results on the VLT/FORS-1 spectroscopic survey of amplified sources and multiple images in the lensing cluster AC114. Background sources were selected in the c…
Photometric Redshifts and Gravitational Telescopes
R. Pello, M. Bolzonella, J. F. Le Borgne +8
We review the use of photometric redshifts in the particular context of Gravitational Telescopes. We discuss on the possible application of such a technique to the study of both th…
Constraining from weak lensing in clusters: the triplet method
L. Gautret, B. Fort, Y. Mellier
We present a new geometrical method which uses weak gravitational lensing effects in clusters to constrain the cosmological parameters Omega and Lambda. On each background galaxy,…
Gravitational Lensing and Tests of the Cosmological Constant
B. Fort, Y. Mellier
The case for a flat Cold Dark Matter model with a positive cosmological constant has been recently strongly advocated by some theoreticians. In this paper we give the observers…
Detection of Weak Lensing in the Fields of Luminous Radiosources
B. Fort, Y. Mellier, M. Dantel-Fort +2
We present a first attempt to reveal the possible existence of large foreground mass condensations directly responsible for the gravitational magnification of four distant luminous…