Kinematics and Composition of the Galactic Bulge: Recent Progress

Details Kinematics and Composition of the Galactic Bulge: Recent Progress Kinematics and Composition of the Galactic Bulge: Recent Progress

2007-10-26

arxiv.org/abs/0710.5162v1

Astronomy and Astrophysics

Astrophysics

6 pages, 6 figures, contributed paper at IAU Symposium 245 "Formation and Evolution of Galactic Bulges"

Scientific paper

10.1017/S174392130801805X

We present recent results from a Keck study of the composition of the Galactic bulge, as well as results from the bulge Bulge Radial Velocity Assay (BRAVA). Culminating a 10 year investigation, Fulbright, McWilliam, & Rich (2006, 2007) solved the problem of deriving the iron abundance in the Galactic bulge, and find enhanced alpha element abundances, consistent with the earlier work of McWilliam & Rich (1994). We also report on a radial velocity survey of {\sl 2MASS}-selected M giant stars in the Galactic bulge, observed with the CTIO 4m Hydra multi-object spectrograph. This program is to test dynamical models of the bulge and to search for and map any dynamically cold substructure in the Galactic bulge. We show initial results on fields at $-10^{\circ} < l <+10^{\circ}$ and $b=-4^{\circ}$. We construct a longitude-velocity plot for the bulge stars and the model data, and find that contrary to previous studies, the bulge does not rotate as a solid body; from $-5^{\circ}

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