HI in Early-Type Galaxies

Tom Oosterloo, Raffaella Morganti, Elaine Sadler, PASA, 16 (1), 28
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Contents Page: Volume 16, Number 1

HI in Early-Type Galaxies

Tom Oosterloo1
Raffaella Morganti2
Elaine Sadler3

1 Istituto di Fisica Cosmica, CNR, Via Bassini 15, 20133 Milan, Italy
toosterl@ifctr.mi.cnr.it

2 Istituto di Radioastronomia, CNR, Via Gobetti 101, 40129 Bologna, Italy
rmorgant@ira.bo.cnr.it

3 School of Physics, University of Sydney, Australia, NSW 2006
ems@physics.usyd.edu.au

Abstract:

We summarize 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.

Keywords: galaxies: elliptical and lenticular, cD - galaxies: ISM





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