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HI in Early-type Galaxies

Published online by Cambridge University Press:  05 March 2013

Tom Oosterloo ,
Raffaella Morganti  and
Elaine Sadler
Tom Oosterloo
Affiliation:
Istituto di Fisica Cosmica, CNR, Via Bassini 15, 20133 Milan, Italy; toosterl@ifctr.mi.cnr.it
Raffaella Morganti
Affiliation:
Istituto di Radioastronomia, CNR, Via Gobetti 101, 40129 Bologna, Italy; rmorgant@ira.bo.cnr.it
Elaine Sadler
Affiliation:
School of Physics, University of Sydney, NSW 2006, Australia; ems@physics.usyd.edu.au
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Abstract

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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.

Keywords

galaxies: elliptical and lenticular, cDgalaxies: ISM
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 16 , Issue 1 , 1999 , pp. 28 - 34
Copyright
Copyright © Astronomical Society of Australia 1999

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