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Gas and Galaxy Formation

Published online by Cambridge University Press:  05 March 2013

P. E. J. Nulsen
P. E. J. Nulsen*
Affiliation:
Department of Engineering Physics, University of Wollongong, Wollongong, NSW 2522, Australia; pejn@uow.edu.au
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Abstract

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The theory of galaxy formation is reviewed briefly. From the evidence of clusters today, the primordial gas fraction was 20% or more. Thus, while the Universe is dominated by dark matter, gas plays an appreciable role in galaxy formation. Collapses of dwarf protogalaxies produce predominantly cold gas. It is argued that, in such cold collapses, the collapsed gas is largely self-gravitating. As a result, gas processes play a critical role in determining the visible structure of galaxies.

Keywords

galaxies: formation
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 16 , Issue 1 , 1999 , pp. 3 - 7
Copyright
Copyright © Astronomical Society of Australia 1999

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