Determination of the dynamical structure of galaxies using optical spectra

Astronomy and Astrophysics – Astrophysics

Scientific paper

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14 pages, 14 figures, Latexfile, MNRAS, in press

Scientific paper

10.1046/j.1365-8711.1998.01579.x

Galaxy spectra are a rich source of kinematical information since the shapes of the absorption lines reflect the movement of stars along the line-of-sight. We present a technique to directly build a dynamical model for a galaxy by fitting model spectra, calculated from a dynamical model, to the observed galaxy spectra. Using synthetic spectra from a known galaxy model we demonstrate that this technique indeed recovers the essential dynamical characteristics of the galaxy model. Moreover, the method allows a statistically meaningful error analysis on the resulting dynamical quantities.

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