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We present a novel approach to constrain the formation channels ofUltra-Compact Dwarf Galaxies (UCDs). This inhomogeneous class of objects ofremnants of tidally stripped dwarf elliptical galaxies and high mass globularclusters. We use three methods to unravel their nature: 1) we analysed theirsurface brightness profiles, 2) we carried out a direct search for tidalfeatures around UCDs and 3) we compared the spatial distribution of GCs andUCDs in the halo of their host galaxy.  Based on FORS2 observations, we have studied the detailed structuralcomposition of a large sample of 97 UCDs in the halo of NGC1399, the centralgalaxy of the Fornax cluster, by analysing theirsurface brightness profiles. Wederived the structural parameters of 13 extended UCDs modelling them with asingle Sersic function and decomposing them into composite King and Sersicprofiles. We find evidence for faint stellar envelopes at mu=~26 mag\arcsec^-2surrounding the UCDs up to an extension of 90pc in radius.  We also show new evidence for faint asymmetric structures and tidal tail-likefeatures surrounding several of these UCDs, a possible tracer of their originand assembly history within their host galaxy halos. In particular, we presentevidence for the first discovery of a significant tidal tail with an extensionof ~350pc around UCD-FORS2.  We searched for local overdensities in the spatial distribution of globularclusters within the halo of NGC1399, to see if they are related to thepositions of the UCDs. We found a local overabundance of globular clusters on ascale of <1kpc around UCDs, when we compare it to the distribution of globularsfrom the host galaxy. This effect is strongest for the metal-poor blue GCs. Wediscuss how likely it is that these clustered globulars were originallyassociated with the UCD.

Globular cluster clustering and tidal features around ultra compact dwarf galaxies in the halo of NGC1399