2011

Substructure in the lens HE 0435-1223

Fadely, Ross, Keeton, Charles R.

Understand

We investigate the properties of dark matter substructure in the gravitational lens HE 0435-1223 (z_l=0.455) via its effects on the positions and flux ratios of the quadruply-imaged background quasar (z_s=1.689).

We start with a smooth mass model, add individual, truncated isothermal clumps near the lensed images, and use the Bayesian evidence to compare the quality of different models.
Compared with smooth models, models with at least one clump near image A are strongly favored.
The mass of this clump within its Einstein radius is log(Mein/Msun) = 7.65 +0.87/-0.84.

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