Mathematics – Logic
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986rspta.320..447v&link_type=abstract
(Royal Society Discussion on Material Content of the Universe, London, England, Oct. 23, 24, 1985) Royal Society (London), Philo
Mathematics
Logic
240
Astronomical Models, Dark Matter, Galactic Structure, Spiral Galaxies, Disk Galaxies, Galactic Rotation, Halos, Mass Distribution, Shapes
Scientific paper
Mass models of spiral galaxies based on the observed light distribution, assuming constant M/L for bulge and disk, are able to reproduce the observed rotation curves in the inner regions, but fail to do so increasingly towards and beyond the edge of the visible material. The discrepancy in the outer region can be accounted for by invoking dark matter; some galaxies require at least four times as much dark matter as luminous matter. There is no evidence for a dependence on galaxy luminosity or morphological type. Various arguments support the idea that a distribution of visible matter with constant M/L is responsible for the circular velocity in the inner region, i.e., inside approximately 2.5 disk scale-lengths. Luminous matter and dark matter seem to 'conspire' to produce the flat observed rotation curves in the outer region. It seems unlikely that this coupling between disk and halo results from the large-scale gravitational interaction between the two components. Attempts to determine the shape of dark halos have not yet produced convincing results.
Sancisi Renzo
van Albada Tjeerd S.
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