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The results of the Fornax Compact Object Survey (FCOS) are presented. TheFCOS aims at investigating the nature of the Ultra Compact Dwarf galaxies(UCDs) recently discovered in the center of the Fornax cluster (Drinkwater etal. 2000). 280 unresolved objects in the magnitude space covering UCDs andbright globular clusters (18<V<21 mag) were observed spectroscopically. 54 newFornax members were discovered, plus five of the seven already known UCDs.Their distribution in radial velocity, colour, magnitude and space wasinvestigated. It is found that bright compact objects (V<20 or M_V<-11.4 mag),including the UCDs, have a higher mean velocity than faint compact objects(V>20 mag) at 96% confidence. The mean velocity of the bright compact objectsis consistent with that of the dwarf galaxy population in Fornax, butinconsistent with that of NGC 1399's globular cluster system at 93.5%confidence. The compact objects follow a colour magnitude relation with a slopevery similar to that of normal dEs, but shifted about 0.2 mag redwards. Themagnitude distribution of compact objects shows a fluent transition betweenUCDs and GCs with an overpopulation of 8 +/- 4 objects for V<20 mag withrespect to the extrapolation of NGC 1399's GC luminosity function. The spatialdistribution of bright compact objects is in comparison to the faint ones moreextended at 88% confidence. All our findings are consistent with the threshingscenario (Bekki et al. 2003), suggesting that a substantial fraction of compactFornax members brighter than V~20 mag could be created by threshing dE,Ns.Fainter than V~20 mag, the majority of the objects seem to be genuine GCs. Ourresults are also consistent with merged stellar super-clusters (Fellhauer &Kroupa 2002) as an alternative explanation for the bright compact objects.Comment: 15 pages, 11 figures, accepted for publication in A&

Fornax compact object survey FCOS: On the nature of Ultra Compact Dwarf galaxies