Astronomy and Astrophysics – Astrophysics
Scientific paper
1995-10-30
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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