From kinematics to dynamics in thin galactic disk

Details From kinematics to dynamics in thin galactic disk From kinematics to dynamics in thin galactic disk

2000-07-17

arxiv.org/abs/astro-ph/0007227v1

Mon.Not.Roy.Astron.Soc. 318 (2000) 40

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS, 8 pages, 4 figures

Scientific paper

We present a method for recovering the distribution functions of edge-on thin axisymmetric disks directly from their observable kinematic properties. The most generally observable properties of such a stellar system are the line-of-sight velocity distributions of the stars at different projected radii along the galaxy. If the gravitational potential is known, then the general two-integral distribution function can be reconstructed using the shapes of the high-velocity tails of these line-of-sight distributions. If the wrong gravitational potential is adopted, then a distribution function can still be constructed using this technique, but the low-velocity parts of the observed velocity distributions will not be reproduced by the derived dynamical model. Thus, the gravitational potential is also tightly constrained by the observed kinematics.

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