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20 April 2024 |
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Kinematics and Composition of the Galactic Bulge: Recent Progre | | R. Michael Rich
; Christian Howard
; David B. Reitzel
; HongSheng Zhao
; Roberto de Propri
; | | Date: |
26 Oct 2007 | | Abstract: | 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 $-5^{circ}<l<+5^{circ}$ the
rotation curve has a slope of $approx 100 km s^{-1}$ and flattens considerably
at greater $l$ and reaches a maximum rotation of $45 {km s^{-1}}$
(heliocentric) or $sim 70 {km s^{-1}}$ (Galactocentric). This rotation is
slower than that predicted by the dynamical model of Zhao (1996). | | Source: | arXiv, 0710.5162 | | Services: | Forum | Review | PDF | Favorites | |
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