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Modelling strong lenses from wide-field ground-based observations in KiDS and GAMA

Knabel, Shawn; Holwerda, B. W.; Nightingale, J.; Treu, T.; Bilicki, M.; Brough, S.; Driver, S.; Finnerty, L.; Haberzettl, L.; Hegde, S.; Hopkins, A. M.; Kuijken, K.; Liske, J.; Pimblett, A. K.; Steele, R. C.; Wright, A. H.

Authors

Shawn Knabel

B. W. Holwerda

J. Nightingale

T. Treu

M. Bilicki

S. Brough

S. Driver

L. Finnerty

L. Haberzettl

S. Hegde

A. M. Hopkins

K. Kuijken

J. Liske

R. C. Steele

A. H. Wright



Abstract

Despite the success of galaxy-scale strong gravitational lens studies with Hubble-quality imaging, a number of well-studied strong lenses remains small. As a result, robust comparisons of the lens models to theoretical predictions are difficult. This motivates our application of automated Bayesian lens modelling methods to observations from public data releases of overlapping large ground-based imaging and spectroscopic surveys: Kilo-Degree Survey (KiDS) and Galaxy and Mass Assembly (GAMA), respectively. We use the open-source lens modelling software PYAUTOLENS to perform our analysis. We demonstrate the feasibility of strong lens modelling with large-survey data at lower resolution as a complementary avenue to studies that utilize more time-consuming and expensive observations of individual lenses at higher resolution. We discuss advantages and challenges, with special consideration given to determining background source redshifts from single-aperture spectra and to disentangling foreground lens and background source light. High uncertainties in the best-fitting parameters for the models due to the limits of optical resolution in ground-based observatories and the small sample size can be improved with future study. We give broadly applicable recommendations for future efforts, and with proper application, this approach could yield measurements in the quantities needed for robust statistical inference.

Citation

Knabel, S., Holwerda, B. W., Nightingale, J., Treu, T., Bilicki, M., Brough, S., Driver, S., Finnerty, L., Haberzettl, L., Hegde, S., Hopkins, A. M., Kuijken, K., Liske, J., Pimblett, A. K., Steele, R. C., & Wright, A. H. (2023). Modelling strong lenses from wide-field ground-based observations in KiDS and GAMA. Monthly notices of the Royal Astronomical Society, 520(1), 804-827. https://doi.org/10.1093/mnras/stad133

Journal Article Type Article
Acceptance Date Jan 9, 2023
Online Publication Date Jan 14, 2023
Publication Date Mar 1, 2023
Deposit Date Mar 13, 2025
Publicly Available Date Mar 14, 2025
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 520
Issue 1
Pages 804-827
DOI https://doi.org/10.1093/mnras/stad133
Keywords Gravitational lensing: strong; Methods: observational; Galaxies: elliptical and lenticular; cD; Galaxies: evolution; Galaxies: structure
Public URL https://hull-repository.worktribe.com/output/5082055

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2023 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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