The Various Kinematics of Dwarf Irregular Galaxies in Nearby Groups and their Dark Matter Distributions
Eight dwarf irregular galaxies, in the two nearby groups of galaxies Sculptor and Centaurus A (at 2.5 Mpc and 3.5 Mpc), have been imaged in neutral hydrogen (H I) with the Australia Telescope and the Very Large Array. These galaxies have absolute magnitudes ranging from MB = -15.7 to -11.3. Yet they are mostly rotationally supported, with maximum velocities going from 19 to 67 km s-1. Multicomponent mass models have been fitted to the rotation curves to investigate the properties of their dark...[Show more]
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