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Fig. 6


R-band image of UCD-FORS 2 (Y99025) overlaid with green contour lines of isophotes with constant surface brightness levels. The density levels correspond to 2, 3, 5, 10 and 30σ above the background. The 2σ contour corresponds to a surface brightness level of μ = 26.0 mag/arcsec2. Three tidal features are clearly visible in the image. One extends towards the North-West (lower right) and is above the 3σ level for all its extension with a small 5σ peak in its middle. The tidal feature extending towards East (top) is enclosed by the 2σ isophote with a 3σ peak in the middle. On the northern side of the object (to the right) there are also clear distortions in the isophote shape visible which are around 250 pc in extent at the 5σ level, and even the 10σ isophote is clearly distorted. The two large tidal tails if measured from the center of the UCD have an apparent extension of ~ 350 pc at μ = 26.0 mag/arcsec2. The white arrow shows the direction towards the center of NGC 1399.

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