The Gini Coefficient as a Tool for Image Family Idenitification in
  Strong Lensing Systems with Multiple Images
  The sample of cosmological strong lensing systems has been steadily growing
in recent years and with the advent of the next generation of space-based
survey telescopes, the sample will reach into the thousands. The accuracy of
strong lens models relies on robust identification of multiple image families
of lensed galaxies. For the most massive lenses, often more than one background
galaxy is magnified and multiply-imaged, and even in the cases of only a single
lensed source, identification of counter images is not always robust. Recently,
we have shown that the Gini coefficient in space-telescope-quality imaging is a
measurement of galaxy morphology that is relatively well-preserved by strong
gravitational lensing. Here, we investigate its usefulness as a diagnostic for
the purposes of image family identification and show that it can remove some of
the degeneracies encountered when using color as the sole diagnostic, and can
do so without the need for additional observations since whenever a color is
available, two Gini coefficients are as well.
