Interstellar medium disruption in the Centaurus A group

Details Interstellar medium disruption in the Centaurus A group Interstellar medium disruption in the Centaurus A group

2006-11-14

arxiv.org/abs/astro-ph/0611423v1

Astron.J.133:261-269,2007

Astronomy and Astrophysics

Astrophysics

7 figures, 2 tables

Scientific paper

10.1086/509132

We present the results of a 21 cm neutral hydrogen (HI) line detection experiment in the direction of 18 low luminosity dwarf galaxies of the Centaurus A group, using the Australia Telescope National Facility 64m Parkes Radio Telescope and the Australia Telescope Compact Array. Five dwarfs have HI masses between M_HI=4x10^5 to M_HI=2.1x10^7 Msol and 0.0410^7 Msol or M_HI<10^6 Msol. This gap may be explained by the ram pressure stripping mechanism at work in this dense environment where all galaxies with M_HI<10^7 Msol have been stripped of their gas. The required intergalactic medium density to achieve this is ~10^-3 cm^-3.

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