Properties of three gas-rich dwarfs in the Centaurus A group

Details Properties of three gas-rich dwarfs in the Centaurus A group Properties of three gas-rich dwarfs in the Centaurus A group

2003-09-02

arxiv.org/abs/astro-ph/0309050v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure, to be published in the proceedings of the conference "Satellites and Tidal Streams", La Palma 26-30 May 200

Scientific paper

We present HST/WFPC2 observations (F555W, F814W) and ATCA high resolution HI maps of three gas-rich dwarf galaxies in the Centaurus A group discovered in two blind 21-cm surveys (HIPASS, HIDEEP). We compare their individual properties and discuss their star formation history. Although we can not 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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