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

J 2025

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

TANG, Xianzhe T. Z.; Simon BIRRER; Anowar J. SHAJIB; Narayan KHADKA; Henry James BEST V et. al.

Základní údaje

Originální název

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

Autoři

TANG, Xianzhe T. Z.; Simon BIRRER; Anowar J. SHAJIB; Narayan KHADKA a Henry James BEST V

Vydání

Journal of Cosmology and Astroparticle Physics, IOP Publishing Ltd, 2025, 1475-7516

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Velká Británie a Severní Irsko

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 5.900 v roce 2024

Organizační jednotka

Přírodovědecká fakulta

DOI

https://doi.org/10.1088/1475-7516/2025/10/043

UT WoS

001591486200003

EID Scopus

2-s2.0-105019069202

Klíčová slova anglicky

cosmological simulations; gravitational lensing; weak gravitational lensing

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 18. 11. 2025 14:54, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

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.

Návaznosti

GM24-10599M, projekt VaV

Název: Hvězdy v galaktických jádrech: vzájemný vztah s masivními černými dírami

Investor: Grantová agentura ČR, Hvězdy v galaktických jádrech: vzájemný vztah s masivními černými dírami

Citovat

TANG, Xianzhe T. Z.; Simon BIRRER; Anowar J. SHAJIB; Narayan KHADKA a Henry James BEST V. Analyzing line-of-sight selection biases in galaxy-scale strong lensing with external convergence and shear. Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd, 2025, roč. 2025, č. 10, s. 1-27. ISSN 1475-7516. Dostupné z: https://doi.org/10.1088/1475-7516/2025/10/043.

@article{2533790,
   author = {Tang, Xianzhe T. Z. and Birrer, Simon and Shajib, Anowar J. and Khadka, Narayan and Best V, Henry James},
   article_number = {10},
   doi = {https://doi.org/10.1088/1475-7516/2025/10/043},
   keywords = {cosmological simulations; gravitational lensing; weak gravitational lensing},
   language = {eng},
   issn = {1475-7516},
   journal = {Journal of Cosmology and Astroparticle Physics},
   title = {Analyzing line-of-sight selection biases in galaxy-scale strong lensing with external convergence and shear},
   url = {https://iopscience.iop.org/article/10.1088/1475-7516/2025/10/043},
   volume = {2025},
   year = {2025}
}

TY  - JOUR
ID  - 2533790
AU  - Tang, Xianzhe T. Z. - Birrer, Simon - Shajib, Anowar J. - Khadka, Narayan - Best V, Henry James
PY  - 2025
TI  - Analyzing line-of-sight selection biases in galaxy-scale strong lensing with external convergence and shear
JF  - Journal of Cosmology and Astroparticle Physics
VL  - 2025
IS  - 10
SP  - 1-27
EP  - 1-27
PB  - IOP Publishing Ltd
SN  - 14757516
KW  - cosmological simulations
KW  - gravitational lensing
KW  - weak gravitational lensing
UR  - https://iopscience.iop.org/article/10.1088/1475-7516/2025/10/043
N2  - 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.
ER  -

TANG, Xianzhe T. Z.; Simon BIRRER; Anowar J. SHAJIB; Narayan KHADKA a Henry James BEST V. Analyzing line-of-sight selection biases in galaxy-scale strong lensing with external convergence and shear. \textit{Journal of Cosmology and Astroparticle Physics}. IOP Publishing Ltd, 2025, roč.~2025, č.~10, s.~1-27. ISSN~1475-7516. Dostupné z: https://doi.org/10.1088/1475-7516/2025/10/043.

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