Astrometric perturbations in substructure lensing

  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},
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… 
Strong lensing signatures of luminous structure and substructure in early-type galaxies
The arrival times, positions, and fluxes of multiple images in strong lens systems can be used to infer the presence of dark subhalos in the deflector, and thus test predictions of cold dark matter
Numerical investigation of lens models with substructures using the perturbative method
We present a statistical study of the effects induced by substructures on the deflection potential of dark matter haloes in the strong lensing regime. This investigation is based on the pertubative
A New Channel for Detecting Dark Matter Substructure in Galaxies: Gravitational Lens Time Delays
We show that dark matter substructure in galaxy-scale halos perturbs the time delays between images in strong gravitational lens systems. The variance of the effect depends on the subhalo mass
Substructure in the lens HE 0435-1223
We investigate the properties of dark matter substructure in the gravitational lens HE 0435−1223 (zl=0.455) via its effects on the positions and flux ratios of the quadruply imaged background quasar
COSMOGRAIL: the COSmological MOnitoring of GRAvItational Lenses VIII. Deconvolution of high resolution near-IR images and simple mass models for 7 gravitationally lensed quasars
Aims. We attempt to place very accurate positional constraints on seven gravitationally lensed quasars currently being monitored by the COSMOGRAIL collaboration, and shape parameters for the light
Luminous satellite galaxies in gravitational lenses
Substructures, expected in cold dark matter haloes, have been proposed to explain the anomalous flux ratios in gravitational lenses. About 25 per cent of lenses in the Cosmic Lens All-Sky Survey
Spectrophotometric variability of quasars caused by lensing of diffuse massive substructure: consequences on flux anomaly and precise astrometric measurements
We investigate the spectro-photometric variability of quasars due to lensing of small mass substructure (from several tens to several hundreds solar masses). The aim of this paper is to explore the
Effects of dark matter substructures on gravitational lensing: results from the Aquarius simulations
We use the high-resolution Aquarius simulations of the formation of Milky Way-sized haloes in the Λ cold dark matter cosmology to study the effects of dark matter substructures on gravitational
Halometry from astrometry
Halometry---mapping out the spectrum, location, and kinematics of nonluminous structures inside the Galactic halo---can be realized via variable weak gravitational lensing of the apparent motions of
We investigate how strong lensing of dusty, star-forming galaxies (DSFGs) by foreground galaxies can be used as a probe of dark matter halo substructure. We find that spatially resolved spectroscopy


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
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
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