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| Paper: |
Multiwavelength Rotation Curves to Test Dark Halo Central Shapes |
| Volume: |
282, Galaxies: The Third Dimension |
| Page: |
129 |
| Authors: |
Blais-Ouellette, S.; Carignan, C.; Amram, P. |
| Abstract: |
A sample of 10 rotation curves of spiral galaxies observed in both Fabry-Perot spectroscopy and aperture synthesis radio observations is used to investigate the mass distribution of luminous and dark matter. The individual mass models are presented using 4 different parametrizations. It is shown that galaxies with a maximal rotation velocity Vmax <~ 90 kms have a dark halo with an inner density slope γ <~ 0.6. Also, a strong correlation with moderate scatter is found between the characteristic density and radius, the two free parameters of halo functional forms. The sample is also modeled with the MOND prescription which gives good fits for 8 galaxies but fails to reproduce the rotation curve of UGC 2259 and NGC 3109. Nonetheless, the ``universal constant'' a0 needs to be systematically higher for lower surface brightness galaxies. |
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