Dark matter in spiral galaxies. III. The Sa galaxies
Luminosity profiles have been obtained for 14 Sa galaxies with optical rotation curves measured by Rubin et al. (1985). The rotation curves and bulge dynamics for about half of the galaxies were found to agree with theoretical predictions assuming a typical mass/light ratio. The other half have slow-rising rotation curves that are inconsistent with the light distribution and bulge dynamics. The proposed explanation for this inconsistency is that the rotation curves in the bulge-dominated parts of these galaxies are not measuring their true velocities. Central bulge velocity dispersions are computed by using the measured bulge light distribution and a mass profile given by the rotation curves. For the normal velocities, the predicted dispersions match the observed values reasonably well, while for the massless bulge galaxies the predicted dispersion is always low, by a factor of 3 in the worst case. 31 references.
- Research Organization:
- Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA)
- OSTI ID:
- 6753280
- Journal Information:
- Astron. J.; (United States), Journal Name: Astron. J.; (United States) Vol. 96; ISSN ANJOA
- Country of Publication:
- United States
- Language:
- English
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