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:
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.
- the lensed image reconstruction (using the non-parametric source
reconstruction method described in Koopmans 2005)
- the dynamical modeling (which is based on an implementation of the
two-integral Schwarzschild method described by Verolme & de Zeeuw
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