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Institut d'Astrophysique et
de Géophysique (Bât. B5c)

Quartier Agora
Allée du 6 août, 19C
B-4000 Liège 1 (Sart-Tilman)
Belgique

Tel.: 04.366.9774
Fax: 04.366.9729

Séminaires : Documents

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Georgios Vernardos, <gvernard@astro.rug.nl>
7ème séminaire : Jeudi 11 avril, 16h00
Probing dark matter in galactic scales with gravitational lensing
Georgios Vernardos (University of Groningen)

The tension between dark matter theory and observations that exists in sub-galactic scales has given rise to challenging problems, among which the infamous `missing satellites’ and `cusp-core’ problems. Gravitational lensing is a unique tool to address these problems due to its ability to detect dark matter properties and its connection to baryons at cosmological distances. I will present recent advances in the gravitational imaging technique – a method used to reconstruct the lensing potential and the source brightness profile from strong lensing features in observed lenses, like arcs and rings. In particular, a new, general, and powerful statistical treatment will be introduced, which enables the coherent study of small scale dark matter perturbations, or higher order moments in the global lens potential, allowing for a simultaneous derivation of their degeneracies for the first time. An initial application to a few simulated lens systems will be presented as well.
Université de Liège > Faculté des Sciences > Département d'Astrophysique, Géophysique et Océanographie : CoWebAGO, Juin 2009.