Dynamical Modelling of Hot Stellar Systems

Details Dynamical Modelling of Hot Stellar Systems Dynamical Modelling of Hot Stellar Systems

1995-10-30

arxiv.org/abs/astro-ph/9510150v1

Astronomy and Astrophysics

Astrophysics

uuencoded gziped PostScript, 20 pages including figures; to appear in ESO/EIPC Workshop, "Structure, Dynamics and Chemical Evo

Scientific paper

Estimation of the distribution function f and potential Phi of hot stellar systems from kinematical data is discussed. When the functional forms of f and Phi are not specified a priori, accurate estimation of either function requires very high quality data: either accurate ``line profiles'' at radii extending well beyond an effective radius, or large samples of discrete radial velocities. Estimates of Phi(r) based on much smaller data sets can be very strongly influenced by assumptions, explicit or implicit, about the form of f. The importance of casting the estimation problem into a mathematically determined form is stressed. Some techniques for nonparametric estimation are presented, with some preliminary results of their application to real stellar systems.

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