TDCOSMO XXIX: JWST/NIRSpec IFU Spatially Resolved Kinematics of Three Time-delay Lenses

@misc{knabel2026tdcosmo,
  title = {{TDCOSMO XXIX: JWST/NIRSpec IFU Spatially Resolved Kinematics of Three Time-delay Lenses}},
  author = {Shawn Knabel and Pritom Mozumdar and Anowar J. Shajib and Tommaso Treu and Devon M. Williams and Michele Cappellari and David Law and Simon Birrer and Takahiro Morishita and William Sheu and Massimo Stiavelli},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.03089},
  eprint = {2609.03089},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.03089},
}

TY  - UNPB
TI  - TDCOSMO XXIX: JWST/NIRSpec IFU Spatially Resolved Kinematics of Three Time-delay Lenses
AU  - Shawn Knabel
AU  - Pritom Mozumdar
AU  - Anowar J. Shajib
AU  - Tommaso Treu
AU  - Devon M. Williams
AU  - Michele Cappellari
AU  - David Law
AU  - Simon Birrer
AU  - Takahiro Morishita
AU  - William Sheu
AU  - Massimo Stiavelli
PY  - 2026
DA  - 2026/09/02
PB  - arXiv
DO  - 10.48550/arxiv.2609.03089
UR  - https://arxiv.org/abs/2609.03089
AB  - Spatially resolved stellar kinematics are critical to the high precision achieved by cosmological probes utilizing time delays of strongly lensed quasars. Combined with high-resolution imaging and lens modeling, dynamical models of the 2D resolved kinematics of the deflector galaxy tightly constrain the mass profile and break the mass-sheet degeneracy, in turn providing tight constraints on the Hubble constant when the time delays are included. We extract stellar kinematics of the deflector galaxies in the quadruply lensed quasar systems HE0435-1223, PG1115+080, and WFI2033-4723 from James Webb Space Telescope Near-Infrared Spectrograph (JWST-NIRSpec) integral field spectroscopy. The kinematic maps reach average per-bin total (statistical and systematic) uncertainties of 6-11%, with average bin-to-bin correlated errors of only ∼ 1.2%. The aperture-integrated velocity dispersions are statistically consistent with the values used in the previous TDCOSMO analysis (all within 0.9σ), with their average uncertainty reduced from 3.7% to 2.4% owing to improvements in the data reduction and kinematic-extraction methodology. We classify PG1115+080 as a fast rotator, HE0435-1223 and WFI2033-4723 as slow rotators within the probed radii, and we refine the source redshifts from the kinematics of the lensed host galaxies. Kinematic maps will be combined with time delays, lens models, and line-of-sight convergence estimates to measure cosmological parameters in the upcoming TDCOSMO 2026 milestone publication.
ER  -