Schedule Sep 28, 2006
Combining Gravitational Lensing and Stellar Dynamics
Mr. Matteo Barnabè, Kapteyn Astro Inst. & KITP

In this short talk I will sketch out the main features of the method we have been developing to perform a joint and fully self-consistent analysis of lens E/S0 galaxies combining information from both strong gravitational lensing and stellar dynamics. An axisymmetric gravitational potential which is function of some non-linear parameters is assumed and consistently used for both:

  1. the lensed image reconstruction (using the non-parametric source reconstruction method described in Koopmans 2005)
  2. the dynamical modeling (which is based on an implementation of the two-integral Schwarzschild method described by Verolme & de Zeeuw 2002).
The method takes advantage of the fact that both problems are linear, and can therefore be solved in a fast and efficient non-iterative way. The most likely values for the non-linear parameters of the potential are then found with an iterative optimization scheme based on the maximization of the bayesian evidence. This approach also allows objective comparison between different sets of models. The described method is going to be applied in the next future to the sample of lens galaxies from the SLACS survey, for which full datasets are already available for about 15 systems.

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