Background Giants in the Field of the Globular Cluster M22: Kinematics of the Galactic Bulge

Details Background Giants in the Field of the Globular Cluster M22: Kinematics of the Galactic Bulge Background Giants in the Field of the Globular Cluster M22: Kinematics of the Galactic Bulge

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aj....112..590m&link_type=abstract

Astronomical Journal v.112, p.590

Astronomy and Astrophysics

Astronomy

5

Globular Clusters: Individual: M22, Galaxy: Kinematics And Dynamics, Galaxy: Halo

Scientific paper

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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