Kavli Affiliate: Joshua A. Frieman
| First 5 Authors: Simon Birrer, Elizabeth J. Buckley-Geer, Michele Cappellari, Frederic Courbin, Frederic Dux
| Summary:
We present cosmological constraints from 8 strongly lensed quasars
(hereafter, the TDCOSMO-2025 sample). Building on previous work, our analysis
incorporated new deflector stellar velocity dispersions measured from spectra
obtained with the James Webb Space Telescope (JWST), the Keck Telescopes, and
the Very Large Telescope (VLT), utilizing improved methods. We used integrated
JWST stellar kinematics for 5 lenses, VLT-MUSE for 2, and resolved kinematics
from Keck and JWST for RX J1131-1231. We also considered two samples of
non-time-delay lenses: 11 from the Sloan Lens ACS (SLACS) sample with Keck-KCWI
resolved kinematics; and 4 from the Strong Lenses in the Legacy Survey (SL2S)
sample. We improved our analysis of line-of-sight effects, the surface
brightness profile of the lens galaxies, and orbital anisotropy, and corrected
for projection effects in the dynamics. Our uncertainties are maximally
conservative by accounting for the mass-sheet degeneracy in the deflectors’
mass density profiles. The analysis was blinded to prevent experimenter bias.
Our primary result is based on the TDCOSMO-2025 sample, in combination with
$Omega_{rm m}$ constraints from the Pantheon+ Type Ia supernovae (SN)
dataset. In the flat $Lambda$ Cold Dark Matter (CDM), we find
$H_0=72.1^{+4.0}_{-3.7}$ km s$^{-1}$ Mpc$^{-1}$. The SLACS and SL2S samples are
in excellent agreement with the TDCOSMO-2025 sample, improving the precision on
$H_0$ in flat $Lambda$CDM to 4.4%. Using the Dark Energy Survey SN Year-5
dataset (DES-SN5YR) or DESI-DR2 baryonic acoustic oscillations (BAO)
likelihoods instead of Pantheon+ yields very similar results. We also present
constraints in the open $Lambda$CDM, $w$CDM, $w_0w_a$CDM, and $w_{phi}$CDM
cosmologies. The TDCOSMO $H_0$ inference is robust and consistent across all
presented cosmological models, and our cosmological constraints in them agree
with those from the BAO and SN.
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