TDCOSMO. XXVII. JWST-based Lens Models and H_0 Measurement of WFI2033, HE0435, and PG1115

Abstract

Time-delay cosmography offers a one-step, distance-ladder-independent route to the Hubble-Lemaitre constant, H_0. We present new cosmography-grade lens models of three quadruply imaged quasars based on JWST-NIRCam/F115W imaging (WFI2033-4723, HE0435-1223, PG1115+080). We use the STARRED modeling technique, introduced in our previous analysis of WFI2033-4723, to reconstruct the complex JWST-NIRCam Point Spread Function at high fidelity. We combine NIRCam-based lens models with improved external convergence estimates, published time delays, and aperture-integrated stellar velocity dispersions from JWST NIRSpec to infer H_0. The analysis was carried out blindly for HE0435-1223 and PG1115+080, while it was not blind for WFI2033-4723, as we build upon the previous published model. For comparison with previous HST-based work, we limit our analysis to the case of no internal mass-sheet degeneracy (λ_int=1). We quantify the impact of improved imaging, single-aperture kinematics, and environment measurements on central values and uncertainties. Within flat ΛCDM, assuming a uniform prior on Ω_m, we find H_0 = 71.8_−7.0^+9.2 λ_int km s⁻¹ Mpc⁻¹ for PG1115+080, 74.2_−4.2^+4.2 λ_int km s⁻¹ Mpc⁻¹ for HE0435-1223, and 73.4_−4.4^+3.4 λ_int km s⁻¹ Mpc⁻¹ for WFI2033-4723. Combining the three lenses yields H_0 = 73.5_−2.8^+2.7 λ_int km s⁻¹ Mpc⁻¹, consistent with HST-based results (73.6_−2.6^+2.6 λ_int km s⁻¹ Mpc⁻¹), but with reduced scatter between the three systems. These models will be incorporated in the TDCOSMO-2026 milestone paper with free λ_int in a hierarchical fashion. We close by outlining how 16 forthcoming JWST NIRCam targets will further tighten uncertainties toward percent-level precision on H_0.

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TDCOSMO XXIX: JWST/NIRSpec IFU Spatially Resolved Kinematics of Three Time-delay Lenses
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arXiv2 Sep 2026PreprintarXiv licenceFull textCosmology GalaxiesarXiv
TDCOSMO XXX: Spatially resolved kinematics of the deflectors in time-delay lens systems B1608+656 and SDSSJ1206+4332 from JWST-NIRSpec observation
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arXiv8 Sep 2026PreprintCC BY 4.0Full textCosmology GalaxiesarXiv

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BibTeX RIS

BibTeX

@misc{williams2026tdcosmo,
  title = {{TDCOSMO. XXVII. JWST-based Lens Models and H$_0$ Measurement of WFI2033, HE0435, and PG1115}},
  author = {D. M. Williams and T. Treu and D. P. Johnson and P. Mozumdar and S. Knabel and S. Birrer and C. D. Fassnacht and A. Galan and A. J. Shajib and K. C. Wong and M. Cappellari and F. Courbin and T. Morishita and V. Motta and D. Sluse and M. Stiavelli},
  howpublished = {arXiv},
  year = {2026},
  month = aug,
  doi = {10.48550/arxiv.2608.27566},
  eprint = {2608.27566},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2608.27566},
}

RIS

TY  - UNPB
TI  - TDCOSMO. XXVII. JWST-based Lens Models and H_0 Measurement of WFI2033, HE0435, and PG1115
AU  - D. M. Williams
AU  - T. Treu
AU  - D. P. Johnson
AU  - P. Mozumdar
AU  - S. Knabel
AU  - S. Birrer
AU  - C. D. Fassnacht
AU  - A. Galan
AU  - A. J. Shajib
AU  - K. C. Wong
AU  - M. Cappellari
AU  - F. Courbin
AU  - T. Morishita
AU  - V. Motta
AU  - D. Sluse
AU  - M. Stiavelli
PY  - 2026
DA  - 2026/08/27
PB  - arXiv
DO  - 10.48550/arxiv.2608.27566
UR  - https://arxiv.org/abs/2608.27566
AB  - Time-delay cosmography offers a one-step, distance-ladder-independent route to the Hubble-Lemaitre constant, H_0. We present new cosmography-grade lens models of three quadruply imaged quasars based on JWST-NIRCam/F115W imaging (WFI2033-4723, HE0435-1223, PG1115+080). We use the STARRED modeling technique, introduced in our previous analysis of WFI2033-4723, to reconstruct the complex JWST-NIRCam Point Spread Function at high fidelity. We combine NIRCam-based lens models with improved external convergence estimates, published time delays, and aperture-integrated stellar velocity dispersions from JWST NIRSpec to infer H_0. The analysis was carried out blindly for HE0435-1223 and PG1115+080, while it was not blind for WFI2033-4723, as we build upon the previous published model. For comparison with previous HST-based work, we limit our analysis to the case of no internal mass-sheet degeneracy (λ_int=1). We quantify the impact of improved imaging, single-aperture kinematics, and environment measurements on central values and uncertainties. Within flat ΛCDM, assuming a uniform prior on Ω_m, we find H_0 = 71.8_−7.0^+9.2 λ_int km s^−1 Mpc^−1 for PG1115+080, 74.2_−4.2^+4.2 λ_int km s^−1 Mpc^−1 for HE0435-1223, and 73.4_−4.4^+3.4 λ_int km s^−1 Mpc^−1 for WFI2033-4723. Combining the three lenses yields H_0 = 73.5_−2.8^+2.7 λ_int km s^−1 Mpc^−1, consistent with HST-based results (73.6_−2.6^+2.6 λ_int km s^−1 Mpc^−1), but with reduced scatter between the three systems. These models will be incorporated in the TDCOSMO-2026 milestone paper with free λ_int in a hierarchical fashion. We close by outlining how 16 forthcoming JWST NIRCam targets will further tighten uncertainties toward percent-level precision on H_0.
ER  -

TDCOSMO. XXVII. JWST-based Lens Models and H₀ Measurement of WFI2033, HE0435, and PG1115

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