Abstract
We present the results of a 21 cm neutral hydrogen (H I) line detection experiment in the direction of 18 low-luminosity dwarf galaxies of the Centaurus A group, using the Australia Telescope National Facility 64 m Parkes Radio Telescope and the Australia Telescope Compact Array. Five dwarfs have H I masses between M = 4 × 105 and 2.1 × 107 M⊙ and 0.04 M⊙ L 107 or M < 106 M⊙. This gap may be explained by the ram pressure stripping mechanism at work in this dense environment in which all galaxies with M < 107 M⊙ have been stripped of their gas. The required intergalactic medium density to achieve this is ~10-3 cm-3.
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