Dynamics of the Galactic Bulge Using Planetary Nebulae

Sylvie F Beaulieu, Kenneth C Freeman, Agris J Kalnajs, Prasenjit Saha, Hongsheng Zhao

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

Evidence for a bar at the center of the Milky Way triggered a renewed enthusiasm for dynamical modeling 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, Fur, and Kalnajs), and one is a Schwarzschild system constructed to represent the three-dimensional 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. The procedure finds the parameters of each model, i.e., the solar galacto-centric distance R-0 in model units, the orientation angle phi, the velocity scale (in km s(-1) per model unit), and the solar tangential velocity that best fit the data.

Original languageEnglish
Pages (from-to)855-871
Number of pages17
JournalAstronomical Journal
Volume120
Issue number2
Publication statusPublished - Aug 2000

Keywords

  • Galaxy : kinematics and dynamics
  • planetary nebulae : general
  • BODY BARRED MODELS
  • MILKY-WAY
  • SHAPED BULGES
  • BAADE-WINDOW
  • OUTER REGIONS
  • GAS-DYNAMICS
  • GALAXY
  • KINEMATICS
  • DISK
  • ROTATION

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