A Bayesian Approach to Gravitational Lens Model Selection, SCMAV proceeding

Details A Bayesian Approach to Gravitational Lens Model Selection, SCMAV proceeding A Bayesian Approach to Gravitational Lens Model Selection, SCMAV proceeding

2011-09-13

arxiv.org/abs/1109.2902v2

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

Proceeding of the Statistical Challenges in Modern Astronomy V conference

Scientific paper

Strong gravitational lenses are unique cosmological probes. These produce multiple images of a single source. Whether a single galaxy, a group or a cluster, extracting cosmologically relevant information requires an accurate modeling of the lens mass distribution. A variety of models are available to this purpose, nevertheless discrimination between them as primarely relied on the quality of fit without accounting for the size of the prior model parameter space. This is a problem of model selection that we address in the Bayesian statistics framework by evaluating Bayes' factors. Using simple test cases, we show that the assumption of more complicate lens models may not be justified given the level of accuracy of the available data.

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