Astrometric Perturbations in Substructure Lensing

@article{Chen2007AstrometricPI,
  title={Astrometric Perturbations in Substructure Lensing},
  author={Jacqueline Chen and Eduardo Rozo and Neal Dalal and James E. Taylor},
  journal={The Astrophysical Journal},
  year={2007},
  volume={659},
  pages={52 - 68}
}
In recent years gravitational lensing has been used as a means to detect substructure in galaxy-sized halos, via anomalous flux ratios in quadruply imaged lenses. In addition to causing anomalous flux ratios, substructure may also perturb the positions of lensed images at observable levels. In this paper we numerically investigate the scale of such astrometric perturbations using realistic models of substructure distributions. Substructure distributions that project clumps near the Einstein… 
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