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 AIfA and Ccapp and Osu and Cita and UWaterloo},
  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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References

SHOWING 1-10 OF 57 REFERENCES
Compound Gravitational Lensing as a Probe of Dark Matter Substructure within Galaxy Halos
We show how observations of multiply imaged quasars at high redshift can be used as a probe of dark matter clumps (subhalos with masses 109 M☉) within the virialized extent of more massive lensing
The signature of substructure on gravitational lensing in the Lambda CDM cosmological model
We present a study of the lens properties of quadruply imaged systems, lensed by numerically simulated galaxies. We investigate a simulated elliptical and disc galaxy drawn from high resolution
TESTS FOR SUBSTRUCTURE IN GRAVITATIONAL LENSES
The flux anomalies in four-image gravitational lenses can be interpreted as evidence for the dark matter substructure predicted by cold dark matter (CDM) halo models. In principle, these flux
Simulations of strong gravitational lensing with substructure
Galactic-sized gravitational lenses are simulated by combining a cosmological N-body simulation and models for the baryonic component of the galaxy. The lens caustics, critical curves, image
Statistics of magnification perturbations by substructure in the cold dark matter cosmological model
We study the statistical properties of magnification perturbations by substructures in strong lensed systems using linear perturbation theory and an analytical substructure model including tidal
Probing Dark Matter Substructure in Lens Galaxies
We investigate the eUects of numerous dark matter subhalos in a galaxy-sized halo on the events of strong lensing to assess their presence as expected from the cold dark matter scenario. Lens
Evidence for substructure in lens galaxies
We discuss whether one should expect that multiply imaged QSOs can be understood with ‘simple’ lens models that contain only a few parameters. Whereas for many lens systems such simple mass models
Extended Source Effects in Substructure Lensing
We investigate the extended source size effects on gravitational lensing in which a lens consists of a smooth potential and small mass clumps ("substructure lensing"). We first consider a lens model
THREE-DIMENSIONAL MAPPING OF CDM SUBSTRUCTURE AT SUBMILLIMETER WAVELENGTHS
The cold dark matter (CDM) structure formation model predicts that about 5%-10% of a typical galactic halo of mass ~1012 M☉ is in substructures with masses 108 M☉. To directly detect such
B1422+231: The influence of mass substructure on strong lensing
In this work we investigate the gravitationally lensed system B1422+231. High-quality VLBI image positions, fluxes and shapes as well as an optical HST lens galaxy position are used. First, two
...
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