HI Imaging of HIPASS-Selected Early-Type Galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We present the preliminary results of VLA HI imaging of a statistically well-defined sample of 37 HIPASS-selected early-type galaxies. The target galaxies are all relatively nearby (20 Mpc to 110 Mpc) and optically classified as ellipticals. Our sample compliments that of Oosterloo et al. 2006, which was heavily weighted towards lenticulars. This project aims to provide much needed statistical information regarding the properties of cold gas in elliptical galaxies, which will ultimately help constrain the general formation histories of elliptical vs. lenticular galaxies. After reducing the data from the first few targets in our sample, it is clear that the confusion problem with the Parkes beam is significant. Our results demonstrate that the HI morphologies of elliptical galaxies are varied - we find some rather regular, relaxed disks as well as disturbed, interacting systems with interesting prominent features such as HI tidal tails.

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