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Paper: Properties of Three Gas-Rich Dwarfs in the Centaurus A Group
Volume: 327, Satellites and Tidal Streams
Page: 324
Authors: Grossi, M.; Disney, M.J.; Minchin, R.F.; Pritzl, B.J.; Knezek, P.M.; Saha, A.; Gallagher, J.S.; Freeman, K.C.
Abstract: We present HST/WFPC2 observations (F555W, F814W) and ATCA high resolution H I maps of three gas-rich dwarf galaxies in the Centaurus A group discovered in two blind 21 cm surveys (HIPASS and HIDEEP). We compare their individual properties and discuss their star formation history. Although we cannot constrain the age of the oldest population from the diagrams very well, the presence of an extended population of red giant stars suggests that these systems were not formed recently. The presence of asymptotic giant branch (AGB) stars in two out of three dwarfs, sets a lower limit on the age of about 6 Gyr.
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