Fig. 9.
Top: effective radii of stellar systems versus stellar mass. Bottom: effective surface mass density (Σeff = M*/2πReff) versus stellar mass. The data were mostly collected and presented in Misgeld & Hilker (2011). We include a few more UCDs from Norris & Kannappan (2011), Liu et al. (2015), Sandoval et al. (2015) and Schweizer et al. (2018) and NSCs from Georgiev et al. (2016). Known NSC-type UCDs are marked by the solid black dots as well as M 54 and ωCentauri. FCC 47-UCD1 is given by the blue star.
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