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1999ApJS..124..383C - Astrophys. J., Suppl. Ser., 124, 383-401 (1999/October-0)
Axisymmetric three-integral models for galaxies.
CRETTON N., DE ZEEUW P.T., VAN DER MAREL R.P. and RIX H.-W.
Abstract (from CDS):
In an earlier paper (Rix et al.) we described the basic principles and implemented them for the simplest case of spherical geometry. Here we focus on the axisymmetric case. We first show how to build galaxy models from individual orbits. This provides a method to build models with fully general DFs, without the need for analytic integrals of motion. We then discuss a set of alternative building blocks, the two-integral and the isotropic components, for which the observable properties can be computed analytically. Models built entirely from the two-integral components yield DFs of the form f(E, Lz), which depend only on the energy E and angular momentum Lz. This provides a new method to construct such models. The smoothness of the two-integral and isotropic components also makes them convenient to use in conjunction with the regular orbits.
We have tested our method by using it to reconstruct the properties of a two-integral model built with independent software. The test model is reproduced satisfactorily, either with the regular orbits, or with the two-integral components. This paper mainly deals with the technical aspects of the method, while applications to the galaxies M32 and NGC 4342 are described elsewhere (van der Marel et al.; Cretton & van den Bosch).
Abstract Copyright: ∼
Journal keyword(s): Black Hole Physics - Galaxies: Elliptical and Lenticular, cD - Galaxies: Kinematics and Dynamics - Galaxies: Structure
Simbad objects: 2
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