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HI in Shell Galaxies and Other Merger Remnants

Published online by Cambridge University Press:  05 March 2013

David Malin  and
Brian Hadley
David Malin
Affiliation:
Anglo Australian Observatory, PO Box 296, Epping, NSW 2121, Australia; [email protected]
Brian Hadley
Affiliation:
Royal Observatory, Edinburgh, Blackford Hill, Edinburgh, EH9 3HJ, UK
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Abstract

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The few elliptical galaxies with detected HI almost all seem to have optical peculiarities as well, though these are often well hidden and require special image enhancement techniques to reveal them. In this paper we show several deep images of ellipticals with optical shells which are associated with HI, and suggest that mergers, or at least encounters with gas-rich galaxies, are responsible. We also show some disk galaxies with unusual faint extensions, some of them the kinds of interactions that may result in HI in ellipticals. These illustrations are drawn from an atlas of low surface brightness images of bright galaxies currently in preparation.

Keywords

galaxies: elliptical and lenticulargalaxies: interactionsgalaxies: structuregalaxies: halos
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 14 , Issue 1 , 1997 , pp. 52 - 58
Copyright
Copyright © Astronomical Society of Australia 1997

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