An Examination of Kinematic Properties of Dwarf Irregular Galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We present an investigation of the kinematic properties of twenty-eight dwarf irregular galaxies using spatially resolved neutral hydrogen maps from the Very Large Array. We explore several scaling relations, including both the classical and baryonic Tully-Fisher relations, mass relations, and metallicity-luminosity relations and offer comparisons to gas rich late-type spirals. In addition, we examine correlations between dark and luminous matter (stellar and gaseous) for the dwarf irregular galaxies with both optical and neutral hydrogen images. While it is known that dwarf irregular galaxies fall off the classical Tully-Fisher relation, further support is offered for the baryonic Tully-Fisher relation being the underlying relation for both spiral and dwarf irregular galaxies. We discuss these results in the context of downsizing and galaxy evolution.

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