Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-04
Astronomy and Astrophysics
Astrophysics
48 pages (Latex), 30 figures (PS), accepted for pub. in AJ
Scientific paper
10.1086/301504
Evidence for a bar at the center of the Milky Way triggered a renewed enthusiasm for dynamical modelling of the Galactic bar-bulge. Our goal is to compare the kinematics of a sample of tracers, planetary nebulae, widely distributed over the bulge with the corresponding kinematics for a range of models of the inner Galaxy. Three of these models are N-body barred systems arising from the instabilities of a stellar disk (Sellwood, Fux and Kalnajs), and one is a Schwarzschild system constructed to represent the 3D distribution of the COBE/DIRBE near-IR light and then evolved as an N-body system for a few dynamical times (Zhao). For the comparison of our data with the models, we use a new technique developed by Saha (1998). The procedure finds the parameters of each model, i.e. the solar galactocentric distance R_o in model units, the orientation angle phi, the velocity scale (in km/s per model unit), and the solar tangential velocity which best fit the data.
Beaulieu Sylvie F.
Freeman Kenneth C.
Kalnajs Agris J.
Saha Prasenjit
Zhao HongSheng
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