TY - JOUR
T1 - Background giants in the field of the globular cluster M22
T2 - Kinematics of the galactic bulge
AU - Minniti, Dante
AU - Liebert, James
AU - Olszewski, Edward W.
AU - White, Simon D.M.
PY - 1996/8
Y1 - 1996/8
N2 - We report radial velocities, metallicities, and near-IR photometry for about 100 giants in the field of the globular cluster M22, at l,b=(9.9°,-7.6°). Most of them are bulge giants, non-members of the cluster from proper motions. Dividing the sample according to metallicity, we find that the giants more metal-poor than [Fe/H]≈-1 have halo-like kinematics, while the more metal-rich giants have higher rotation and smaller velocity dispersion, which we identify with the bulge. Such dependences of kinematics on metal abundance (which may be due to a mix of populations) are predicted by dissipational collapse models of formation for the inner Galaxy. The 11 M giants in the field follow bulge rather than halo kinematics.
AB - We report radial velocities, metallicities, and near-IR photometry for about 100 giants in the field of the globular cluster M22, at l,b=(9.9°,-7.6°). Most of them are bulge giants, non-members of the cluster from proper motions. Dividing the sample according to metallicity, we find that the giants more metal-poor than [Fe/H]≈-1 have halo-like kinematics, while the more metal-rich giants have higher rotation and smaller velocity dispersion, which we identify with the bulge. Such dependences of kinematics on metal abundance (which may be due to a mix of populations) are predicted by dissipational collapse models of formation for the inner Galaxy. The 11 M giants in the field follow bulge rather than halo kinematics.
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U2 - 10.1086/118036
DO - 10.1086/118036
M3 - Article
AN - SCOPUS:0346614563
SN - 0004-6256
VL - 112
SP - 590
EP - 600
JO - Astronomical Journal
JF - Astronomical Journal
IS - 2
ER -