Measuring line-of-sight shear with Einstein rings: a proof of concept

Author:

Hogg Natalie B1ORCID,Fleury Pierre1,Larena Julien2,Martinelli Matteo34

Affiliation:

1. Institut de Physique Théorique, Université Paris-Saclay, CNRS, CEA , F-91191 Gif-sur-Yvette, France

2. Laboratoire Univers et Particules de Montpellier, Université de Montpellier, CNRS , F-34095 Montpellier, France

3. INAF – Osservatorio Astronomico di Roma , via Frascati 33, I-00040 Monteporzio Catone (Roma), Italy

4. INFN – Sezione di Roma , Piazzale Aldo Moro, 2 – c/o Dipartimento di Fisica, Edificio G. Marconi, I-00185 Roma, Italy

Abstract

ABSTRACTLine-of-sight effects in strong gravitational lensing have long been treated as a nuisance. However, it was recently proposed that the line-of-sight shear could be a cosmological observable in its own right, if it is not degenerate with lens model parameters. We first demonstrate that the line-of-sight shear can be accurately measured from a simple simulated strong lensing image with per cent precision. We then extend our analysis to more complex simulated images and stress test the recovery of the line-of-sight shear when using deficient fitting models, finding that it escapes from degeneracies with lens model parameters, albeit at the expense of the precision. Lastly, we check the validity of the tidal approximation by simulating and fitting an image generated in the presence of many line-of-sight dark matter haloes, finding that an explicit violation of the tidal approximation does not necessarily prevent one from measuring the line-of-sight shear.

Funder

SEPNet

University of Portsmouth

CEA

University of Montpellier

Agenzia Spaziale Italiana

INFN

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 7 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Weak lensing of strong lensing: beyond the tidal regime;Journal of Cosmology and Astroparticle Physics;2024-08-01

2. Time-Delay Cosmography: Measuring the Hubble Constant and Other Cosmological Parameters with Strong Gravitational Lensing;Space Science Reviews;2024-06-17

3. Strong gravitational lensing’s ‘external shear’ is not shear;Monthly Notices of the Royal Astronomical Society;2024-06-03

4. Classical Cosmology II. The Einstein Ring;Journal of High Energy Physics, Gravitation and Cosmology;2024

5. Anisotropic strong lensing as a probe of dark matter self-interactions;Monthly Notices of the Royal Astronomical Society;2023-10-12

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