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24 April 2024 |
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Dynamics of the Galactic Bulge using Planetary Nebulae | | Sylvie F. Beaulieu
; Kenneth C. Freeman
; Agris J. Kalnajs
; Prasenjit Saha
; HongSheng Zhao
; | | Date: |
4 May 2000 | | Subject: | astro-ph | | Affiliation: | IoA, Cambridge), Kenneth C. Freeman (RSAA, MSSSO), Agris J. Kalnajs (RSAA, MSSSO), Prasenjit Saha (Queen Mary and Westfield College), HongSheng Zhao (Sterrewacht Leiden | | Abstract: | 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. | | Source: | arXiv, astro-ph/0005086 | | Services: | Forum | Review | PDF | Favorites | |
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