Preprint
Sep 2026
TDCOSMO XXXI: New techniques in line-of-sight studies of time delay lenses
The distribution of matter along the same line of sight but external to the main lens, quantified by $\kappa_\mathrm{ext}$, is a key source of uncertainty in time delay cosmography and other applications of strong lensing, and must be independently estimated to avoid biasing the inferred value of the Hubble constant ($...
Daniel Johnson, Devon Williams, C. Fassnacht et al.
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