Gas and Galaxy Formation

P.E.J. Nulsen, PASA, 16 (1), 3
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Next Section: Introduction
Contents Page: Volume 16, Number 1

Gas and Galaxy Formation

P.E.J. Nulsen 1

1 Department of Engineering Physics, University of Wollongong, Wollongong, NSW 2522, Australia
EMAIL pejn@uow.edu.au

Abstract:

The theory of galaxy formation is reviewed briefly. From the evidence of clusters today, the primordial gas fraction was 20 percent 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





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