Dwarf galaxies in the NGC 5128 Group

Astronomy and Astrophysics – Astronomy

Scientific paper

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Galactic Clusters, Galaxies, Galactic Structure, Luminous Intensity, Spatial Distribution, Stellar Evolution, Tables (Data)

Scientific paper

Eight dwarf galaxies have been discovered in the NGC 5128 Group of galaxies. Most have low surface brightness, low luminosity and abundant neutral hydrogen. The dispersion around the Tully-Fisher relation between H I line width and optical luminosity increases for these faint galaxies. Star formation in dwarf irregular galaxies is briefly discussed. The NGC 5128 Group is at a mean distance of about 5 Mpc and is probably gravitationally bound. The dwarfs have only a small effect on the dynamics of the Group, but are good indicators of the velocity dispersion.

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