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Title:
Recovery of the internal orbital structure of galaxies
Authors:
van de Ven, G.; de Zeeuw, P. T.; van den Bosch, R. C. E.
Affiliation:
AA(Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, the Netherlands; Department of Astrophysical Sciences, Peyton Hall, Princeton, NJ 08544, USA; Institute for Advanced Study, Einstein Drive, Princeton, NJ 08540, USA), AB(Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, the Netherlands; European Southern Observatory, D-85748 Garching bei München, Germany), AC(Sterrewacht Leiden, Postbus 9513, 2300 RA Leiden, the Netherlands)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 385, Issue 2, pp. 614-646. (MNRAS Homepage)
Publication Date:
04/2008
Origin:
MNRAS
MNRAS Keywords:
stellar dynamics, celestial mechanics, galaxies: elliptical and lenticular, cD, galaxies: kinematics and dynamics, galaxies: structure
DOI:
10.1111/j.1365-2966.2008.12873.x
Bibliographic Code:
2008MNRAS.385..614V

Abstract

We construct axisymmetric and triaxial galaxy models with a phase-space distribution function that depends on linear combinations of the three exact integrals of motion for a separable potential. These Abel models, first introduced by Dejonghe & Laurent and subsequently extended by Mathieu & Dejonghe, are the axisymmetric and triaxial generalizations of the well-known spherical Osipkov-Merritt models. We show that the density and higher order velocity moments, as well as the line-of-sight velocity distribution of these models can be calculated efficiently and that they capture much of the rich internal dynamics of early-type galaxies. We build a triaxial and oblate axisymmetric galaxy model with projected kinematics that mimic the two-dimensional kinematic observations that are obtained with integral-field spectrographs such as SAURON. We fit the simulated observations with axisymmetric and triaxial dynamical models constructed with our numerical implementation of Schwarzschild orbit-superposition method. We find that Schwarzschild method is able to recover the internal dynamics and three-integral distribution function of realistic models of early-type galaxies.
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