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February 5, 2026

Non-halo structures and their effects on gravitationally lensed galaxies

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Authors

BJBaptiste JegoGDGiulia DespaliTRTamara Richardson

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Overview

This analysis investigates non-halo structures' influence on lensing effects in galaxies, revealing subtle impacts on parameters.

Key Points

  • The central aim is to explore how non-halo dark matter structures affect gravitational lensing of galaxies.
  • Utilized fragmentation-free WDM simulations with particle masses of 1 keV and 3 keV.
  • Created mock datasets based on gravitationally lensed systems from the BELLS-Gallery.
  • Incorporated non-halo contributions and compared them to smooth mass distribution mocks.
  • Employed Bayesian modelling to analyze the impact on inferred parameters.
  • Non-halo structures induce subtle shifts in inferred lens parameters and source positions.
  • The growing fraction of mass outside halos correlates with higher thermal velocities of dark matter particles.
  • Subtle variations are absorbed by standard elliptical power-law lens models, complicating detection.
  • Non-halo perturbations do not exhibit strong external shear terms, commonly misinterpreted in analyses.

Cite This Study

Jego et al. (2025) studied this question.

synapsesocial.com/papers/69843433f1d9ada3c1fb1fe8https://doi.org/10.1051/0004-6361/202553940/pdf
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