The impact of line-of-sight structures on measuring $H_0$ with strong lensing time-delays

Abstract

Measurements of The Hubble-Lemaitre constant from early- and local-universe observations show a significant discrepancy. In an attempt to understand the origin of this mismatch, independent techniques to measure H0 are required. One such technique, strong lensing time delays, is set to become a leading contender amongst the myriad methods due to forthcoming large strong lens samples. It is therefore critical to understand the systematic effects inherent in this method. In this paper, we quantify the influence of additional structures along the line-of-sight by adopting realistic light cones derived from the CosmoDC2 semi-analytical extra-galactic catalogue. Using multiple lens plane ray-tracing to create a set of simulated strong lensing systems, we have investigated the impact of line-of-sight structures on time-delay measurements and in turn, on the inferred value of H0. We have also tested the reliability of existing procedures for correcting for line-of-sight effects. We find that if the integrated contribution of the line-of-sight structures is close to a uniform mass sheet, the bias in H0 can be adequately corrected by including a constant external convergence ${\kappa }_{ext}$ in the lens model. However, for realistic line-of-sight structures comprising many galaxies at different redshifts, this simple correction overestimates the bias by an amount that depends linearly on the median external convergence. We, therefore, conclude that lens modelling must incorporate multiple lens planes to account for line-of-sight structures for accurate and precise inference of H0.

arXiv comment12 pages, 8 figures, accepted for publication in MNRAS

References in corpus (59)

• Nine-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Final Maps and Results
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• Tensions between the Early and the Late Universe
• H0LiCOW XIII. A 2.4% measurement of $H_0$ from lensed quasars: $5.3\sigma$ tension between early and late-Universe probes
• Galaxy Luminosity Functions to z~1: DEEP2 vs. COMBO-17 and Implications for Red Galaxy Formation
• The Carnegie-Chicago Hubble Program. VIII. An Independent Determination of the Hubble Constant Based on the Tip of the Red Giant Branch
• A distance to the Large Magellanic Cloud that is precise to one per cent
• The Sloan Lens ACS Survey. III - The Structure and Formation of Early-type Galaxies and their Evolution since z~1
• The Expansion of the Universe is Faster than Expected
• H0LiCOW V. New COSMOGRAIL time delays of HE0435-1223: $H_0$ to 3.8% precision from strong lensing in a flat $\Lambda$CDM model
• Dissecting the Gravitational Lens B1608+656. II. Precision Measurements of the Hubble Constant, Spatial Curvature, and the Dark Energy Equation of State
• Gravitationally lensed quasars and supernovae in future wide-field optical imaging surveys
• H0LiCOW - IX. Cosmographic analysis of the doubly imaged quasar SDSS 1206+4332 and a new measurement of the Hubble constant
• Two accurate time-delay distances from strong lensing: Implications for cosmology
• H0LiCOW I. $H_0$ Lenses in COSMOGRAIL's Wellspring: Program Overview
• The population of galaxy-galaxy strong lenses in forthcoming optical imaging surveys
• Lenstronomy: multi-purpose gravitational lens modelling software package
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Cluster Abundances and Weak Lensing
• A SHARP view of H0LiCOW: $H_0$ from three time-delay gravitational lens systems with adaptive optics imaging
• Elucidating $\Lambda$CDM: Impact of Baryon Acoustic Oscillation Measurements on the Hubble Constant Discrepancy
• STRIDES: a 3.9 per cent measurement of the Hubble constant from the strong lens system DES J0408-5354
• Mass-sheet degeneracy, power-law models and external convergence: Impact on the determination of the Hubble constant from gravitational lensing
• First Cosmological Results using Type Ia Supernovae from the Dark Energy Survey: Measurement of the Hubble Constant
• HACC: Simulating Sky Surveys on State-of-the-Art Supercomputing Architectures
• H0LiCOW IV. Lens mass model of HE 0435-1223 and blind measurement of its time-delay distance for cosmology
• Consistent Calibration of the Tip of the Red Giant Branch in the Large Magellanic Cloud on the Hubble Space Telescope Photometric System and a Re-determination of the Hubble Constant
• Measuring the Hubble constant with Type Ia supernovae as near-infrared standard candles
• Gravitational lens modeling with basis sets
• Strong Lens Time Delay Challenge: II. Results of TDC1
• The BOSS Emission-Line Lens Survey. II. Investigating Mass-Density Profile Evolution in the SLACS+BELLS Strong Gravitational Lens Sample
• CosmoDC2: A Synthetic Sky Catalog for Dark Energy Science with LSST
• The mass-sheet degeneracy and time-delay cosmography: Analysis of the strong lens RXJ1131-1231
• H0LiCOW III. Quantifying the effect of mass along the line of sight to the gravitational lens HE 0435-1223 through weighted galaxy counts
• H0LiCOW XII. Lens mass model of WFI2033-4723 and blind measurement of its time-delay distance and $H_0$
• Space Warps II. New Gravitational Lens Candidates from the CFHTLS Discovered through Citizen Science
• The Masses and Shapes of Dark Matter Halos from Galaxy-Galaxy Lensing in the CFHTLS
• Microlensing Makes Lensed Quasar Time Delays Significantly Time Variable
• A New Hybrid Framework to Efficiently Model Lines of Sight to Gravitational Lenses
• The Outer Rim Simulation: A Path to Many-Core Supercomputers
• The BOSS Emission-Line Lens Survey. IV. : Smooth Lens Models for the BELLS GALLERY Sample
• Quantifying Environmental and Line-of-Sight Effects in Models of Strong Gravitational Lens Systems
• Lens galaxies in the Illustris simulation: power-law models and the bias of the Hubble constant from time-delays
• Improving the precision of time-delay cosmography with observations of galaxies along the line of sight
• The Effect of Environment on Shear in Strong Gravitational Lenses
• Measurements of $H_0$ in modified gravity theories: The role of lensed quasars in the late-time Universe
• Reconstructing the Lensing Mass in the Universe from Photometric Catalogue Data
• Survey of Gravitationally-lensed Objects in HSC Imaging (SuGOHI). II. Environments and Line-of-Sight Structure of Strong Gravitational Lens Galaxies to z ~ 0.8
• H0LiCOW II. Spectroscopic survey and galaxy-group identification of the strong gravitational lens system HE0435-1223
• Strong Lens Time Delay Challenge: I. Experimental Design
• H0LiCOW VIII. A weak lensing measurement of the external convergence in the field of the lensed quasar HE0435$-$1223
• Observational selection biases in time-delay strong lensing and their impact on cosmography
• Line-of-sight effects in strong lensing: Putting theory into practice
• Hubble constant and dark energy inferred from free-form determined time delay distances
• Generalised model-independent characterisation of strong gravitational lenses IV: formalism-intrinsic degeneracies
• PICS: Simulations of Strong Gravitational Lensing in Galaxy Clusters
• A Spectroscopic Survey of the Fields of 28 Strong Gravitational Lenses: The Redshift Catalog
• Reducing biases on $H_0$ measurements using strong lensing and galaxy dynamics: results from the EAGLE simulation
• Ambiguities in gravitational lens models: impact on time delays of the source position transformation
• Large-Distance Lens Uncertainties and Time-Delay Measurements of $H_0$

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• Pixelated Reconstruction of Foreground Density and Background Surface Brightness in Gravitational Lensing Systems using Recurrent Inference Machines
• CURLING -- II. Improvement on the $H_0$ Inference from Pixelized Cluster Strong Lens Modeling
• The Impact of $\text{CLEAN}$ing on Strong Gravitational Lens Modelling
• Impact of Large-Scale Structure along Line-of-Sight on Time-Delay Cosmography
• Time delay measurements with Broken Power Law model
• SDSS-IV MaNGA: A Catalogue of Spectroscopically Detected Strong Galaxy-Galaxy Lens Candidates