Analyzing line-of-sight selection biases in galaxy-scale strong lensing with external convergence and shear

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F25%3A00144513" target="_blank" >RIV/00216224:14310/25:00144513 - isvavai.cz</a>

Result on the web

<a href="https://iopscience.iop.org/article/10.1088/1475-7516/2025/10/043" target="_blank" >https://iopscience.iop.org/article/10.1088/1475-7516/2025/10/043</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1475-7516/2025/10/043" target="_blank" >10.1088/1475-7516/2025/10/043</a>

Result language

angličtina

Original language name

Analyzing line-of-sight selection biases in galaxy-scale strong lensing with external convergence and shear

Original language description

The upcoming Vera Rubin Observatory Legacy Survey of Space and Time (LSST) will dramatically increase the number of strong gravitational lensing systems, requiring precise modeling of line-of-sight (LOS) effects to mitigate biases in lensing observations and cosmological inferences. We develop a method to construct joint distributions of external convergence (κ ext) and shear (γ ext) for strong lensing LOS by aggregating large-scale structure simulations with high-resolution halo renderings and non-linear correction. Our approach captures both smooth background matter and perturbations from halos, enabling accurate modeling of LOS effects. We apply non-linear LOS corrections to κ ext and γ ext that address the non-additive lensing effects caused by objects along the LOS in strong lensing. We find that, with a minimum image separation of 1.0'', non-linear LOS correction due to the presence of a dominant deflector slightly increases the ratio of quadruple to double lenses; this non-linear LOS correction also introduces systematic biases of ∼ 0.1% for galaxy-AGN lens in the inferred Hubble constant (H 0) if not accounted for. We also observe a 0.66% bias for galaxy-galaxy lenses on H 0, and even larger biases 1.02% for galaxy-AGN systems if LOS effects are not accounted for. These results highlight the importance of LOS for precision cosmology. The publicly available code and datasets provide tools for incorporating LOS effects in future analyses.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GM24-10599M" target="_blank" >GM24-10599M: Stars in galactic nuclei: interrelation with massive black holes</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Cosmology and Astroparticle Physics

ISSN

1475-7516

e-ISSN

—

Volume of the periodical

2025

Issue of the periodical within the volume

10

Country of publishing house

GB - UNITED KINGDOM

Number of pages

27

Pages from-to

1-27

UT code for WoS article

001591486200003

EID of the result in the Scopus database

2-s2.0-105019069202