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Ultra-Compact Dwarf Galaxies in Galaxy Clusters

Ferguson, Henry C.; Drinkwater, Michael J.; Gregg, Michael D. +5 more

We review the evidence that the ultra-compact dwarf (UCD) galaxies we recently discovered in the Fornax Cluster form a new, previously unknown class of galaxies and we discuss possible scenarios for their formation. We then present recent results that UCDs are also present in the Virgo Cluster, and that there is a much larger than expected populat…

The Stellar Populations of dE Galaxies in Nearby Groups

Da Costa, G. S.

In this contribution Gemini-North NIRI J,K-observations are used to investigate the upper-Asymptotic Giant Branch (AGB) intermediate-age population in the M81 Group dwarf elliptical (dE) F8D1. Hubble Space Telescope (HST) `snapshot' V,I-observations are also analysed to investigate the upper-AGB populations in two other M81 Group dEs, DDO 71 and k…