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Anisotropic Distribution Functions for the Elliptical Galaxy NGC 1600

Published online by Cambridge University Press:  25 May 2016

Michael Matthias  and
Ortwin Gerhard
Michael Matthias
Affiliation:
Astronomisches Institut der Universität Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland
Ortwin Gerhard
Affiliation:
Astronomisches Institut der Universität Basel, Venusstrasse 7, CH-4102 Binningen, Switzerland

Extract

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Three-integral (3I) dynamical models for NGC 1600 were constructed as follows: (i) Lucy-inversion of CCD photometry and gravitational potential as in Binney, Davies, Illingworth (ApJ 361, 78, 1990), assuming axisymmetry. (ii) Third integral by perturbation theory as in Gerhard & Saha (MN 261, 311, 1991). (iii) Two- and three-integral distribution functions as in Dehnen & Gerhard (MN 261, 311, 1993), assuming various anisotropy patterns. The kinematic results from these models are presented in Fig. 1. The best-fitting 3I model (solid line, right panels) has outward-increasing radial anisotropy on the major axis and is nearly isotropic on the minor axis. The M/L of the various 3I-models varies only slightly around M/L=6.2.

Type
Poster Papers
Information
Symposium - International Astronomical Union , Volume 171: New Light on Galaxy Evolution , 1996 , pp. 413
Copyright
Copyright © Kluwer 1996