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Abstract: Dynamical mass estimates of ultra-compact dwarfs galaxies and massiveglobular clusters in the Fornax and Virgo clusters and around the giantelliptical Cen A have revealed some surprising results: 1 above about 10^6M sun the mass-to-light M-L ratio increases with the objects- mass; 2 someUCDs-massive GCs show high M-L values 4 to 6 that are not compatible withstandard stellar population models; and 3 in the luminosity-velocitydispersion diagram, UCDs deviate from the well defined relation of `normal-GCs, being more in line with the Faber-Jackson relation of early-type galaxies.In this contribution, we present the observational evidences for highmass-to-light ratios of UCDs and discuss possible explanations for them.

Author: M. Hilker 1, S. Mieske 1, H. Baumgardt 2, J. Dabringhausen 2 1 ESO-Garching; 2 AIfA-Bonn

Source: https://arxiv.org/

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