Résumé / Abstract Journal-club_Galaxies

Journal-club Galaxies

« The Dark energy American French Team (DAFT/FADA) survey of high redshift clusters and latest results »

Loïc Guennou
Lab. Astroph. Marseille (LAM) (Marseille, France)

We present here the latest results obtained from the American French collaboration called the Dark energy American French Team/French American DArk energy Team (DAFT/FADA). The goal of the DAFT/FADA collaboration is to carry out a weak lensing tomography survey of z = 0.4-0.9 rich clusters of galaxies. Unlike supernovae or other methods such as cluster of galaxy counts, weak lensing tomography is purely based on geometry and does not depend on knowledge of the physics of the objects used as distance indicators. In addition, the reason for analyzing observations in the direction of clusters is that the shear signal is enhanced by about 10 over the field. Our work will eventually contain results obtained on 91 rich clusters from the HST archive combined with ground based work to obtain photo-zs. This combination of photo-z and weak lensing tomography will enable us to constrain the equation of state of dark energy. We present here the latest results obtained so far in this study.
jeudi 5 avril 2012 - 11:30
Salle 281, Institut d'Astrophysique
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