Dwarf galaxies beyond our doorstep: the Centaurus A group
D. Crnojevi\'c (1), E. K. Grebel (1), A. A. Cole (2), A. Koch (3), M., Rejkuba (4), G. Da Costa (5), H. Jerjen (5) ((1) Astronomisches, Rechen-Institut, Zentrum fuer Astronomie der Universitaet Heidelberg,, Germany, (2) School of Mathematics & Physics, University of Tasmania,

TL;DR
This study investigates the properties and evolutionary histories of dwarf galaxies in the nearby Centaurus A group using archival optical and near-infrared data, providing insights into galaxy evolution and environmental effects.
Contribution
It presents detailed physical and evolutionary analyses of dwarf galaxies in the Centaurus A group, including metallicity, star formation histories, and population gradients, using resolved stellar populations.
Findings
Derived metallicity distribution functions for early-type dwarfs
Quantified recent star formation episodes in late-type dwarfs
Compared dwarf galaxy properties with those in the Milky Way and other groups
Abstract
The study of dwarf galaxies in groups is a powerful tool for investigating galaxy evolution, chemical enrichment and environmental effects on these objects. Here we present results obtained for dwarf galaxies in the Centaurus A complex, a dense nearby (~4 Mpc) group that contains two giant galaxies and about 30 dwarf companions of different morphologies and stellar contents. We use archival optical (HST/ACS) and near-infrared (VLT/ISAAC) data to derive physical properties and evolutionary histories from the resolved stellar populations of these dwarf galaxies. In particular, for early-type dwarfs we are able to construct metallicity distribution functions, find population gradients and quantify the intermediate-age star formation episodes. For late-type dwarfs, we compute recent (~1 Gyr) star formation histories and study their stellar distribution. We then compare these results with…
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