
%0 Journal Article
%A Oosterloo, Tom 
%A Sadler, Elaine 
%A Morganti, Raffaella 
%T HI in Early-Type Galaxies
%J Publications of the Astronomical Society of Australia
%D 1999/04/01
%V 16
%N 1
%P 28-34
%K 
%R https://doi.org/10.1071/AS99028
%U https://www.publish.csiro.au/paper/AS99028 
%X We summarise the HI properties of early-type galaxies, in particular the differences in HI morphologies observed in early-type galaxies of different luminosities. We find that in low-luminosity early-type galaxies the HI is almost always in a disk-like structure, with central surface densities high enough for star formation to occur. In a few luminous early-type galaxies the HI is also in a disk or in a ring-like structure, but in most luminous early-type galaxies the HI has a relatively irregular morphology. The surface densities in the HI disks in luminous early-type galaxies are lower than in the HI disks in low-luminosity early-type galaxies and no large-scale star formation should occur in these disks. We discuss these different HI characteristics in the context of other properties of early-type galaxies that correlate with luminosity. 
