Other
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..338..264g&link_type=abstract
Astrometry in the Age of the Next Generation of Large Telescopes, ASP Conference Series, Vol. 338, Proceedings of a meeting held
Other
Scientific paper
Proper motions from the SPM 3 Catalog have been combined with 2MASS near-infrared photometry for a photometrically selected sample of ˜1200 red giants at the South Galactic Pole. The stars are found to be distributed exponentially in the z direction with a scale height of about 780 pc, indicative of the Thick Disk. The U,V velocities are consistent with disk-like motion. The U-component is roughly constant with z, reflecting the peculiar velocity of the Sun. A considerable velocity shear is seen in the mean V-velocity that grows linearly with z. The dispersions in both U and V also show a nearly linear increase as a function of z out to at least 3 kpc.
The shear in the V-component is a consequence of the combined disk/halo gravitational potential and the increase with z in the dynamic pressure that results from the growing velocity dispersion. We find that the measured velocity and velocity-dispersion profiles are inconsistent with a Plummer model and with a simple, spherically symmetric, pseudo-isothermal model of the halo potential.
Dinescu Dana I.
Girard Terrence M.
Korchagin Vladimir I.
Lopez Carlos E. E.
Monet David G.
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