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69 papers · 1 filter
A wide field survey of the distant rich cluster CL0024+1654
T. Treu, R. Ellis, P. Trivedi +5
We describe the first results from a comprehensive study of the distant cluster Cl0024+1654 (z=0.39) based upon a pattern of 38 mosaiced HST-WFPC2 images extending to radii ~5Mpc.…
An Optical Time-Delay for the Lensed BAL Quasar HE2149-2745
I. Burud, F. Courbin, P. Magain +11
We present optical V and i-band light curves of the gravitationally lensed BAL quasar HE2149-2745. The data, obtained with the 1.5m Danish Telescope (ESO-La Silla) between October…
Cosmological Parameter Estimation from CMB and X-ray clusters
M. Douspis, A. Blanchard, R. Sadat +1
We present the results of a combined analysis of cosmic microwave background (CMB) and X-ray galaxy clusters baryon fraction to deduce constraints over 6 in flationnary cosmologica…
The baryon fraction in X-Rays galaxy clusters revisited
R. Sadat, A. Blanchard, M. Douspis
One of the most direct way to constrain the matter density of the universe is to measure the baryon content in X-Rays clusters of galaxies. Typical value of the mean gas mass…
Strong and Weak Lensing Constraints on Galaxy Mass Distribution
Jean-Paul Kneib
Gravitational Lensing is a UNIQUE tool to constrain the mass distribution of collapsed structures, this is particularly true for galaxies, either on a case by case basis using mult…
Pseudo Elliptical Lensing Mass Model: Application to the NFW Mass Distribution
G. Golse, J. -P. Kneib
We introduce analytical expressions for a pseudo fully analytical elliptical projected Navarro, Frenk & White (NFW) mass profile to be used in lensing equations. We propose a forma…