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Recycling of Ghost Galaxies: the Origin of giant HI Ring around NGC 1533

Published online by Cambridge University Press:  26 May 2016

Kenji Bekki ,
Warrick J. Couch ,
Emma Ryan-Weber  and
Rachel Webster
Kenji Bekki
Affiliation:
School of physics, University of New Southwales, Sydney, NSW, 2052, Australia
Warrick J. Couch
Affiliation:
School of physics, University of New Southwales, Sydney, NSW, 2052, Australia
Emma Ryan-Weber
Affiliation:
School of Physics, University of Melbourne, VIC 3010, Australia
Rachel Webster
Affiliation:
School of Physics, University of Melbourne, VIC 3010, Australia

Abstract

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We propose that the giant HI ring recently discovered by HIPASS for S0 galaxy NGC 1533 is formed by unequal-mass merging between gas-rich LSB (low surface brightness: “ghost”) galaxies and HSB disks. The NGC 1533 progenitor HSB spiral is transformed into a barred S0 during merging and the outer HI gas disk of the LSB is transformed into the giant HI ring. We also discuss two different possibilities for the origin of isolated star-forming regions (“ELdot” objects) in the giant gas ring.

Type
Part 3. Ejection and Outflow
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 418 - 419
Copyright
Copyright © Astronomical Society of the Pacific 2004 

References

Ryan-Weber, E., Webster, R., & Bekki, K., 2002, preprint (astro-ph/0209321).Google Scholar
Bekki, K., 1998, ApJ, 499, 635.CrossRefGoogle Scholar