Other
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.193..295f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 193, Oct. 1980, p. 295-311. Research supported by the Consejo Nacional
Other
202
Galactic Rotation, Globular Clusters, Milky Way Galaxy, Dispersion, Kinematics, Random Processes, Velocity Distribution
Scientific paper
Consideration is given to models of the kinematics and consequent dynamics of Galactic globular clusters. A framework is constructed within which it is possible to establish the constraints imposed upon cluster motions by the four observed kinematical quantities (three position components and line-of-sight velocity), and a range of possible kinematical models is obtained for a sample of 66 globular clusters. The observational data are found to be consistent with the cluster system having a uniform rotation velocity independent of position and metallicity amounting to 60 + or - 26 km/sec for a solar rotation velocity of 220 km/sec. The observed line-of-sight velocity dispersion of the population is shown to increase with galactocentric distance, best fitting a simple isotropic and isothermal distribution. If the mean eccentricity of cluster orbits is allowed to depend on scale, a wide range of eccentricities is consistent with the data; however, it is found that all acceptable models imply galactic rotation curves which are either flat or rise with radius and predict a low circular velocity at the solar radius. The globular cluster data are thus concluded to demonstrate the existence of a massive Galactic halo and confirm recent downward revisions of the amplitude of the Galactic rotation curve.
Frenk Carlos S.
White Simon D. M.
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