HI rotation curves of spiral galaxies

Observations of the spiral galaxy NGC 3198 in the 21-cm line are presented.
The H I distribution extends to about two Holmberg radii and the radial velocity field is symmetric and regular over the entire area. A new method for the derivation of rotation curves is described. Results obtained show that the rotation curve of NGC 3198 is flat to within 5 km/s out to the last measured point at 11 disk scale lengths.
This implies a large discrepancy between the observed rotation curve and that predicted from the light distribution.

	Title and contents
	Chapter 1
	Chapter 2
	Chapter 3
	Chapter 4
	Chapter 5
	Samenvatting-summary in Dutch
	Dankbetuiging-Acknowledgement
	Stellingen
	Complete thesis

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