Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-01-13
Astrophys.J. 499 (1998) 41
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the Astrophysical Journal. 49 pages AAStex + 16 figures
Scientific paper
The severity of the mass discrepancy in spiral galaxies is strongly correlated with the central surface brightness of the disk. Progressively lower surface brightness galaxies have ever larger mass discrepancies. No other parameter (luminosity, size, velocity, morphology) is so well correlated with the magnitude of the mass deficit. The rotation curves of low surface brightness disks thus provide a unique data set with which to probe the dark matter distribution in galaxies. The mass discrepancy is apparent from $R = 0$ giving a nearly direct map of the halo mass distribution. The luminous mass is insignificant. Interpreting the data in terms of dark matter leads to troublesome fine-tuning problems. Different observations require contradictory amounts of dark matter. Structure formation theories are as yet far from able to explain the observations.
de Blok Erwin
McGaugh Stacy
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