Satellite galaxies in Milky Way

There are dozens of company galaxies orbiting around our Milky Way.
Theses satellites formed out of Galaxy and were captured by the Milky Way
sometime later. So the properties of these fossil galaxies, like the abundance,
spacial distribution, luminosity will help us to know the formation history of
the Milky Way. In this talk, I will evaluate several issues on these Galactic
satellites, especially on "missing massive satellite problem" and their anisotropy
spacial distribution. These problems really pose a big challenge for our
understanding of the standard LCDM cosmology and galaxy formation model.