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By Alexander J. W.

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Although flat optical rotation curves can rarely provide conclusive evidence for dark matter (because they do not reach out far enough from the centre of the galaxy), these data did keep people thinking about the problem. But the real confirmation came in 1978 with the publication of a PhD thesis by Albert Bosma at the Kapteyn Laboratory in Groningen. Using the Westerbork Radio Synthesis Telescope he compiled 21-cm rotation curves for about twenty spirals, and showed that almost all of these rotation curves were flat out to the edge of the 21-cm data.

The contrast between these two great men could not have been sharper. There was Oort ± the most pre-eminent Dutch (and probably world-wide) astronomer of his time, much beloved and revered by his fellow astronomers. Then there was Zwicky ± an irascible fellow who liked to disagree with the deeply held scientific beliefs of his fellow astronomers, no matter what Contrast between Oort and Zwicky 33 those beliefs might be. He was, in short, both stimulating and irritating. But perhaps another explanation is that Zwicky's results ± which required as much as fifty times the dark matter as luminous matter ± strained the imagination of astronomers.

It is extremely probable that there is even more mass that cannot yet be detected, because it lies beyond the edge of the detectable hydrogen. So the questions remain. How far can the dark matter halo be probed? And is there any way of probing beyond the hydrogen disk of a galaxy? BEYOND THE 21-CM LIMIT When examining the hydrogen distribution in spirals, it seems to have a pretty sharp edge. The density of the hydrogen drops away steadily over scales measured in many kiloparsecs, and then it drops dead over the last kiloparsec or so, and vanishes.

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