Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.286..812v&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 286, Issue 4, pp. 812-824.
Astronomy and Astrophysics
Astronomy
18
Methods, Numerical: Galaxies, Kinematics And Dynamics: Galaxies, Spiral: Galaxies, Structure
Scientific paper
We present a new method for the construction of quasi-self-consistent dynamical models for the stellar component of barred or spiral galaxies, based on the non-linear extension of linear modes. Just like N-body simulations, these barred models are guaranteed to be physical, since they are based on the presence of a global instability in an initially axisymmetric system. In addition, the full distribution function is obtained with very high accuracy and resolution, making this method particularly well suited for the interpretation of high quality observational data, such as line-of-sight velocity distributions (LOSVDs). We show that such a model produces distribution functions, and hence LOSVDs, that are different from models based on purely linear modes. We created a barred galaxy model using this method, and calculated observable kinematics: velocity fields, dispersion fields, vertex deviations and LOSVDs. The behaviour of the stellar component turns out to be qualitatively very similar to the gaseous component, but the kinematic signature of the bar is not so well pronounced, as a result of the presence of velocity dispersion. However, we show that LOSVDs can show a very clear signature of the bar, and may even become double-peaked in some places. This indicates that the comparison of observed stellar line profiles with detailed models may provide important information, such as bar masses and eccentricities, pattern speeds, etc.
Dejonghe Herwig
Vauterin P.
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