Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 484, Issue 4, Pages 4726-4753Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz200
Keywords
ravitational lensing: strong; cosmological parameters; dark energy
Categories
Funding
- NASA from the Space Telescope Science Institute [NAS 5-26555]
- AURA, Inc., under NASA [NAS 5-26555]
- Packard Foundation through a Packard Research fellowship
- NSF [AST-1312329]
- HST [GO-12889]
- Swiss National Science Foundation
- Ministry of Education in Taiwan via Government Scholarship to Study Abroad (GSSA)
- DFG cluster of excellence 'Origin and Structure of the Universe'
- Max Planck Society
- EACOA Fellowship - East Asia Core Observatories Association
- National Astronomical Observatory of Japan
- National Astronomical Observatories of the Chinese Academy of Sciences
- Korea Astronomy and Space Science Institute
- Association of Universities for Research in Astronomy, Inc. under NASA [NAS 5-26555]
- W. M. Keck Foundation
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Center for High-Performance Computing at the University of Utah
- Brazilian Participation Group
- Carnegie Institution for Science, Carnegie Mellon University
- Chilean Participation Group
- French Participation Group, Harvard-Smithsonian Center for Astrophysics, Instituto de Astrofisica de Canarias
- Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe/University of Tokyo
- Korean Participation Group, Lawrence Berkeley National Laboratory
- Leibniz Institut fur Astrophysik Potsdam
- Max-Planck-Institut fur Astronomie (Heidelberg)
- Max-Planck-Institut fur Astrophysik (Garching)
- Max-Planck-Institut fur Extraterrestrische Physik (MPE)
- National Astronomical Observatories of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatorio Nacional/MCTI
- Ohio State University
- Pennsylvania State University
- Shanghai Astronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Portsmouth
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
- STFC [ST/K004182/1] Funding Source: UKRI
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We present a blind time-delay strong lensing (TDSL) cosmographic analysis of the doubly imaged quasar SDSS 1206+4332. We combine the relative time delay between the quasar images, Hubble Space Telescope imaging, the Keck stellar velocity dispersion of the lensing galaxy, and wide-field photometric and spectroscopic data of the field to constrain two angular diameter distance relations. The combined analysis is performed by forward modelling the individual data sets through a Bayesian hierarchical framework, and it is kept blind until the very end to prevent experimenter bias. After unblinding, the inferred distances imply a Hubble constant H-0 = 68.8(-5.1)(+5.4) km s(-1) Mpc(-1), assuming a flat Lambda cold dark matter cosmology with uniform prior on Omega(m) in [0.05, 0.5]. The precision of our cosmographic measurement with the doubly imaged quasar SDSS 1206+4332 is comparable with those of quadruply imaged quasars and opens the path to perform on selected doubles the same analysis as anticipated for quads. Our analysis is based on a completely independent lensing code than our previous three H0LiCOW systems and the new measurement is fully consistent with those. We provide the analysis scripts paired with the publicly available software to facilitate independent analysis (footnote with link to www.h0licow.org). The consistency between blind measurements with independent codes provides an important sanity check on lens modelling systematics. By combining the likelihoods of the four systems under the same prior, we obtain H-0 = 72.5(-2.3)(+2.1) km s(-1) Mpc(-1). This measurement is independent of the distance ladder and other cosmological probes.
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