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Title:
Triaxial orbit based galaxy models with an application to the (apparent) decoupled core galaxy NGC 4365
Authors:
van den Bosch, R. C. E.; van de Ven, G.; Verolme, E. K.; Cappellari, M.; de Zeeuw, P. T.
Affiliation:
AA(Sterrewacht Leiden, Universiteit Leiden, Postbus 9513, 2300 RA Leiden, the Netherlands), AB(Sterrewacht Leiden, Universiteit 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), AC(Sterrewacht Leiden, Universiteit Leiden, Postbus 9513, 2300 RA Leiden, the Netherlands; TNO Defense, Security and Safety, Lange Kleiweg 137, 2280 AA, Rijswijk, the Netherlands), AD(Sterrewacht Leiden, Universiteit Leiden, Postbus 9513, 2300 RA Leiden, the Netherlands; Sub-Department of Astrophysics, University of Oxford, Denys Wilkinson Building, Keble Road, Oxford OX1 3RH), AE(Sterrewacht Leiden, Universiteit Leiden, Postbus 9513, 2300 RA Leiden, the Netherlands; European Southern Observatory, D-85748 Garching bei München, Germany)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 385, Issue 2, pp. 647-666. (MNRAS Homepage)
Publication Date:
04/2008
Origin:
MNRAS
MNRAS Keywords:
galaxies: elliptical and lenticular, cD, galaxies: kinematics and dynamics, galaxies: structure
DOI:
10.1111/j.1365-2966.2008.12874.x
Bibliographic Code:
2008MNRAS.385..647V

Abstract

We present a flexible and efficient method to construct triaxial dynamical models of galaxies with a central black hole, using Schwarzschild's orbital superposition approach. Our method is general and can deal with realistic luminosity distributions, which project to surface brightness distributions that may show position angle twists and ellipticity variations. The models are fit to measurements of the full line-of-sight velocity distribution (wherever available). We verify that our method is able to reproduce theoretical predictions of a three-integral triaxial Abel model. In a companion paper by Ven, de Zeeuw & van den Bosch, we demonstrate that the method recovers the phase-space distribution function. We apply our method to two-dimensional observations of the E3 galaxy NGC 4365, obtained with the integral-field spectrograph SAURON, and study its internal structure, showing that the observed kinematically decoupled core is not physically distinct from the main body and the inner region is close to oblate axisymmetric.
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