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H I Tidal Tails, Bridges and Clouds

Published online by Cambridge University Press:  26 May 2016

Bärbel S. Koribalski
Bärbel S. Koribalski*
Affiliation:
Australia Telescope National Facility, CSIRO, Australia

Abstract

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There is plenty of intergalactic HI gas without any obvious stellar content ranging from (1) extended gas envelopes around some normal and peculiar galaxies, (2) tidal tails/bridges in interacting or merging galaxy systems, (3) large-scale rings around early type galaxies, and (4) detached clouds at varying distances from associated galaxies, but there are few or no isolated HI clouds.

The HIPASS Bright Galaxy Catalog, which covers the whole southern sky, contains only one definite extragalactic HI cloud which is located close to the galaxy NGC 2442 whereas it is sensitive to isolated HI clouds with MHI > 106 x D2 M⊙. The space density of HI clouds is therefore about 1/1000th that of galaxies with the same MHI.

Type
Part 1. Census
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 34 - 40
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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