Mass-Models of Five Nearby Dwarf Irregular Galaxies

Details Mass-Models of Five Nearby Dwarf Irregular Galaxies Mass-Models of Five Nearby Dwarf Irregular Galaxies

1997-04-03

arxiv.org/abs/astro-ph/9704031v1

Astronomy and Astrophysics

Astrophysics

Postscript file (8 pages including 4 figures). To appear in "Dark and Visible Matter in Galaxies and Cosmological Implications

Scientific paper

Five nearby dwarf irregular galaxies, amongst the recently surveyed dwarf members of the Sculptor and Centaurus A groups (at 2.5 Mpc and 3.5 Mpc), have been imaged in neutral hydrogen (HI) with the Australia Telescope and the Very Large Array. These objects have absolute magnitudes M_B in the range -14.9 to -12.7, yet they are clearly rotationally supported, with maximum rotation velocities ranging from 43 km/s to 67 km/s. Multi-component mass-models have been fitted to the rotation curves. We investigate the properties of their dark matter halos, and the scaling laws of the dark matter halos parameters.

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