Résumé / Abstract Seminaire_IAP
« The formation of structures on galactic scales »

Sébastien Peirani

The popular model of hierarchical structure formation in a universe dominated by cold dark matter, while quite successful in matching the observed large-scale density distribution, is currently facing a "small-scale crisis". For instance, the predicted abundance of satellites (or substructures) is more than an order of magnitude larger than the number of dwarf galaxies with comparable mass within the local group.
This "missing satellite problem" represents therefore an ideal framework in order to test theoretical models. In this talk, I will present first a new approach, based on a perturbative theory and numerical modelling, to study and characterize statistical signatures of substructures in the strong lensing regime.
I will then introduce how to improve the current modelling of lenses with hydrodynamical N-body simulations of galaxy formation.
vendredi 20 février 2009 - 11:00
Salle des séminaires Évry Schatzman, Institut d'Astrophysique de Paris
Page web du séminaire / Seminar's webpage