Institute of Astronomy

Weak lensing by large scale structure

SpeakerTalk DateTalk Series
Henk Hoekstra, Leiden29 October 2009Institute of Astronomy Colloquia

Abstract

Intervening structures in the universe give rise to small distortions
in the shapes of distant galaxies. By measuring this tiny coherent
signal, we can study the mass distribution in the universe directly,
without relying on baryonic tracers. This makes weak lensing by large-
scale structures a powerful probe of cosmology. I will review the
topic of cosmic shear and discuss how the signal is extracted from the
data. I will present results from recent surveys, most notably the
CFHT Legacy Survey and COSMOS. Finally I will discuss what will be
required to significantly improve constraints on the properties of
dark energy.

Presentation

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