This thesis describes a successful survey to find dwarf irregular galaxies in
the two most nearby southern groups of galaxies, the Sculptor group at 2.5
Mpc and the Centaurus A group at 3.5 Mpc. Candidates were selected from
a visual search on ESO SRC J films, then observed in neutral hydrogen (HI)
at Parkes, as well as in Ha. In the Sculptor group 12 dwarfs are detected, and
in Centaurus A 20 (from which 21 were already known members), yielding a
dwarf-to-giant ratio of roughly 3. Some...[Show more]
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