Title: The Origins of the Ultra Compact Dwarfs in the Halo of NGC1399. 

Abstract:
Ultra-Compact Dwarf Galaxies (UCDs) have filled the void in the scaling relations of early type 
systems. Before that, no objects were known in the parameter space between classical 
globular cluster and dwarf galaxies. The nature of these objects at sizes of (10-100pc) is still 
widely debated. Two main channels for the formation of these objects have been studied. 
Simulations indicate that UCDs are the surviving nuclei of tidally stripped dwarf galaxies. Others 
have also suggested that in fact UCDs could be the high mass end of the globular cluster mass 
function. 
We have studied the detailed structural composition of a large sample of 109 UCDs in the halo 
of NGC 1399, the central galaxy of the Fornax cluster, by analysing their surface brightness 
profiles. We also present new evidence for faint asymmetric structures and tidal tails 
surrounding several of these UCDs, a possible tracer of their origin and assembly history within 
their host galaxy halos. With new numbers on the abundance of these tidal features within a 
large sample of UCDs, we can constrain the contribution of each formation channel to the final 
luminosity function of UCDs. 
We also studied the local substructures in the spatial distribution of globular clusters within the 
halo of NGC1399 out to 100kpc, to see if these are related to the positions of the UCDs. We 
found a local overabundance of globular clusters on a scale of 1kpc around UCDs, when we 
compare it to the distribution of globulars from the host galaxy. We investigate how likely it is, 
that these clustered globulars were originally part of the ancestor UCD galaxy before it was 
stripped down to it''s nucleus.