Le 6 février 2015
De 10h30 à 12h00
Noam LIBESKIND
AIP, Potsdam
Dwarf galaxies are the smallest yet most most abundant cosmological objects in existence. Yet owing to their low luminosity, they can only be seen in the immediate neighborhood of the Milky Way, a region known as the Local Group. Most of these galaxies have only been recently found and since their discovery have presented the paradigm of structure/galaxy formation (known as the LCDM model) with a number of challenges. Specifically, dwarf galaxies in the Local Group appear to cluster on vast thin planes, an as yet unresolved problem for the model. I will present some ideas to explain the origin of this peculiar set up within the LCDM model that includes an understanding of the structure of the Local Group, as well as report the first observations of a similar set-up around a galaxy exterior to the Local Group.