Lessons from a blind study of simulated lenses: image reconstructions do not always reproduce true convergence
arXiv:1910.10157 · doi:10.1093/mnras/staa108
Abstract
In the coming years, strong gravitational lens discoveries are expected to increase in frequency by two orders of magnitude. Lens-modelling techniques are being developed to prepare for the coming massive influx of new lens data, and blind tests of lens reconstruction with simulated data are needed for validation. In this paper we present a systematic blind study of a sample of 15 simulated strong gravitational lenses from the EAGLE suite of hydrodynamic simulations. We model these lenses with a free-form technique and evaluate reconstructed mass distributions using criteria based on shape, orientation, and lensed image reconstruction. Especially useful is a lensing analogue of the Roche potential in binary star systems, which we call the . This we introduce in order to factor out the well-known problem of steepness or mass-sheet degeneracy. Einstein radii are on average well recovered with a relative error of for quads and for doubles; the position angle of ellipticity is on average also reproduced well up to , but the reconstructed mass maps tend to be too round and too shallow. It is also easy to reproduce the lensed images, but optimising on this criterion does not guarantee better reconstruction of the mass distribution.
arXiv comment20 pages, 12 figures. Published in MNRAS. Agrees with published version
References in corpus (55)
- The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
- The EAGLE simulations of galaxy formation: calibration of subgrid physics and model variations
- The physics driving the cosmic star formation history
- The Sloan Lens ACS Survey. X. Stellar, Dynamical, and Total Mass Correlations of Massive Early-type Galaxies
- The Sloan Lens ACS Survey. III - The Structure and Formation of Early-type Galaxies and their Evolution since z~1
- The EAGLE simulations of galaxy formation: public release of halo and galaxy catalogues
- Massive Dark-matter halos and Evolution of Early-type Galaxies to z=1
- Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys
- Evolution of galaxy stellar masses and star formation rates in the EAGLE simulations
- The Structure & Dynamics of Massive Early-type Galaxies: On Homology, Isothermality and Isotropy inside one Effective Radius
- Baryon effects on the internal structure of LCDM halos in the EAGLE simulations
- H0LiCOW I. Lenses in COSMOGRAIL's Wellspring: Program Overview
- Bayesian Strong Gravitational-Lens Modeling on Adaptive Grids: Objective Detection of Mass Substructure in Galaxies
- Fast Automated Analysis of Strong Gravitational Lenses with Convolutional Neural Networks
- Colours and luminosities of z=0.1 simulated galaxies in the EAGLE simulations
- A Bayesian analysis of regularised source inversions in gravitational lensing
- Two-dimensional kinematics of SLACS lenses: III. Mass structure and dynamics of early-type lens galaxies beyond z ~ 0.1
- The Structure and Dynamics of Luminous and Dark Matter in the Early-Type Lens Galaxy of 0047-281 at z=0.485
- Semi-linear gravitational lens inversion
- The Frontier Fields Lens Modeling Comparison Project
- Size evolution of normal and compact galaxies in the EAGLE simulation
- CMU DeepLens: Deep Learning For Automatic Image-based Galaxy-Galaxy Strong Lens Finding
- The Halos of Satellite Galaxies: the Companion of the Massive Elliptical Lens SL2S J08544-0121
- Source-position transformation -- an approximate invariance in strong gravitational lensing
- Microlensing of the broad line region in 17 lensed quasars
- Finding strong lenses in CFHTLS using convolutional neural networks
- AutoLens: Automated Modeling of a Strong Lens's Light, Mass and Source
- Lensing Degeneracies Revisited
- Space Warps: I. Crowd-sourcing the Discovery of Gravitational Lenses
- Space Warps II. New Gravitational Lens Candidates from the CFHTLS Discovered through Citizen Science
- Decomposition of the visible and dark matter in the Einstein ring 0047-2808 by semi-linear inversion
- A portable modeler of lensed quasars
- Probing dark matter substructure in the gravitational lens HE0435-1223 with the WFC3 grism
- Non-parametric reconstruction of the galaxy-lens in PG1115+080
- Pixelated Lenses and H_0 from Time-delay QSOs
- GLAMER Part I: A Code for Gravitational Lensing Simulations with Adaptive Mesh Refinement
- GLAMER Part II: Multiple Plane Gravitational Lensing
- Gravitational lensing model degeneracies: Is steepness all-important?
- The Sloan Lens ACS Survey. XI. Beyond Hubble resolution: size, luminosity and stellar mass of compact lensed galaxies at intermediate redshift
- The Hubble constant inferred from 18 time-delay lenses
- Strong Gravitational Lensing and the Stellar IMF of Early-type Galaxies
- Hubble constant and dark energy inferred from free-form determined time delay distances
- Non-parametric Reconstruction of Cluster Mass Distribution from Strong Lensing: Modelling Abell 370
- Radial density profiles of time-delay lensing galaxies
- Statistical and systematic uncertainties in pixel-based source reconstruction algorithms for gravitational lensing
- SEAGLE - I: A pipeline for simulating and modeling strong lenses from cosmological hydrodynamic simulations
- Lensed: a code for the forward reconstruction of lenses and sources from strong lensing observations
- Resolving the baryon-fraction profile in lensing galaxies
- Gravitational Lens Recovery with GLASS: Measuring the mass profile and shape of a lens
- Zooming into the Cosmic Horseshoe: new insights on the lens profile and the source shape
- A Sampling Strategy for High-Dimensional Spaces Applied to Free-Form Gravitational Lensing
- Gravitational lens modelling in a citizen science context
- The Einstein Ring 0047-2808 Revisited: A Bayesian Inversion
- Models of gravitational lens candidates from Space Warps CFHTLS
- Constraining the geometry and kinematics of the quasar broad emission line region using gravitational microlensing. II. Comparing models with observations in the lensed quasar HE0435-1223