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Cited by 104Cosmology and Gravitation TheoriesGalaxies: Formation, Evolution, PhenomenaAstrophysical Phenomena and Observations

TDCOSMO: XII. Improved Hubble constant measurement from lensing time delays using spatially resolved stellar kinematics of the lens galaxy

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Shajib, Anowar J., Mozumdar, Pritom, Chen, Geoff C.-F., Treu, Tommaso, Cappellari, Michele, Knabel, Shawn, Suyu, Sherry H., Bennert, Vardha N. +7 more·2023·Astronomy & Astrophysics
DOI 10.1051/0004-6361/202345878
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Abstract

Strong-lensing time delays enable the measurement of the Hubble constant ( H 0 ) independently of other traditional methods. The main limitation to the precision of time-delay cosmography is mass-sheet degeneracy (MSD). Some of the previous TDCOSMO analyses broke the MSD by making standard assumptions about the mass density profile of the lens galaxy, reaching 2% precision from seven lenses. However, this approach could potentially bias the H 0 measurement or underestimate the errors. For this work, we broke the MSD for the first time using spatially resolved kinematics of the lens galaxy in RXJ1131−1231 obtained from the Keck Cosmic Web Imager spectroscopy, in combination with previously published time delay and lens models derived from Hubble Space Telescope imaging. This approach allowed us to robustly estimate H 0 , effectively implementing a maximally flexible mass model. Following a blind analysis, we estimated the angular diameter distance to the lens galaxy D d = 865 −81 +85 Mpc and the time-delay distance D Δt = 2180 −271 +472 Mpc, giving H 0 = 77.1 −7.1 +7.3 km s −1 Mpc −1 – for a flat Λ cold dark matter cosmology. The error budget accounts for all uncertainties, including the MSD inherent to the lens mass profile and line-of-sight effects, and those related to the mass–anisotropy degeneracy and projection effects. Our new measurement is in excellent agreement with those obtained in the past using standard simply parametrized mass profiles for this single system ( H 0 = 78.3 −3.3 +3.4 km s −1 Mpc −1 ) and for seven lenses ( H 0 = 74.2 −1.6 +1.6 km s −1 Mpc −1 ), or for seven lenses using single-aperture kinematics and the same maximally flexible models used by us ( H 0 = 73.3 −5.8 +5.8 km s −1 Mpc −1 ). This agreement corroborates the methodology of time-delay cosmography.

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Authors
Shajib, A. J., Mozumdar, P., Chen, G. C.-F., Treu, T., Cappellari, M., Knabel, S., Suyu, S. H., Bennert, V. N., Frieman, J. A., Sluse, D., Birrer, S., Courbin, F., Fassnacht, C. D., Villafaña, L., & Williams, P. R.
Affiliations
  • University of Chicago (US)
  • University of California, Davis (US)
  • University of California, Los Angeles (US)
  • University of Oxford (GB)
  • Max Planck Institute for Astrophysics (DE)
  • California Polytechnic State University (US)
  • Fermi National Accelerator Laboratory (US)
  • University of Liège (BE)
  • SLAC National Accelerator Laboratory (US)
  • École Polytechnique Fédérale de Lausanne (CH)
ORCID
Venue
Astronomy & Astrophysics
Publisher
EDP Sciences
Published
2023-04-24
Volume
673
Pages
A9
ISSN
  • 0004-6361 (ISSN-L)
  • 1432-0746
DOI
10.1051/0004-6361/202345878
OpenAlex
W4313964065
Cited by
104
References
2
Citations by year
2026: 20 · 2025: 32 · 2024: 40 · 2023: 12
FWCI
11.43
Type
journal article
Language
en
Open access
Licence
Locations
  • Astronomy and Astrophysics (publishedVersion, cc-by)
  • Oxford University Research Archive (ORA) (University of Oxford) (publishedVersion)
  • arXiv (Cornell University) (submittedVersion, cc-by)
  • Springer Link (Chiba Institute of Technology) (submittedVersion)
  • ORBi (University of Liège) (submittedVersion, other-oa)
  • DigitalCommons - CalPoly (California State Polytechnic University) (submittedVersion, cc-by)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
  • OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
  • arXiv (Cornell University) (cc-by)
Funders
  • NASA (HST-HF2-51492)
  • National Science Foundation (AST-1906976, AST-1836016, AST-1907396, AST-1909297)
  • Moore Foundation (8548)
  • Deutsche Forschungsgemeinschaft (EXC-2094-390783311)
  • European Research Council (787886)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Keywords
strong gravitational lensing, time-delay cosmography, Hubble constant, mass-sheet degeneracy, angular diameter distance, time-delay distance, lens mass profile, blind analysis

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