HI 21cm absorbers at moderate redshifts

Galaxies are composed of four basic materials: stars, gas, dust, and dark-matter. The first three can be seen. The dark matter is required to explain the distribution and movement of the visible components, but has not been directly observed. Both the stars and the gas are composed mainly of Hydrogen, while the dust is mostly silicates, and nobody knows exactly what the dark matter is. Elliptical galaxies usually have little gas or dust, and appear to be mostly stars. Spiral galaxies, on the other hand, tend to have lots of gas, and may have quite a bit of dust, as well as the visible stars. The situation is less clear for the other types of galaxies. ...

Zie: Summary

	titlepages/contents
	chapter 1
	chapter 2
	chapter 3
	chapter 4
	chapter 5
	chapter 6
	chapter 7
	acknowledgements
	samenvatting
	summary
	thesis

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