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  4. H0LiCOW-IX. Cosmographic analysis of the doubly imaged quasar SDSS 1206+4332 and a new measurement of the Hubble constant
 
research article

H0LiCOW-IX. Cosmographic analysis of the doubly imaged quasar SDSS 1206+4332 and a new measurement of the Hubble constant

Birrer, S.
•
Treu, T.
•
Rusu, C. E.
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April 1, 2019
Monthly Notices Of The Royal Astronomical Society

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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Type
research article
DOI
10.1093/mnras/stz200
Web of Science ID

WOS:000462414400023

Author(s)
Birrer, S.
Treu, T.
Rusu, C. E.
Bonvin, V.  
Fassnacht, C. D.
Chan, J. H. H.
Agnello, A.  
Shajib, A. J.
Chen, G. C-F.
Auger, M.
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Date Issued

2019-04-01

Publisher

OXFORD UNIV PRESS

Published in
Monthly Notices Of The Royal Astronomical Society
Volume

484

Issue

4

Start page

4726

End page

4753

Subjects

Astronomy & Astrophysics

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ravitational lensing: strong

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cosmological parameters

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dark energy

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gravitationally lensed quasars

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yale-chile musyc

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power-law models

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time delays

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multiwavelength survey

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internal structure

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number counts

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he 0435-1223

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galaxy

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h-0

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASTRO  
SPC  
Available on Infoscience
June 18, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/158099
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