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Paper: Cosmology from Gravitational Lens Time Delays
Volume: 514, Stellar Populations and the Distance Scale
Page: 165
Authors: Wong, K. C.
Abstract: Strong gravitational lens systems with time delays between the multiple images allow measurements of time-delay distances. The latter are primarily sensitive to the Hubble constant, which is key to probing dark energy. We present the latest results from H0LiCOW (H0 Lenses in COSMOGRAIL's Wellspring), a program that aims to measure H0 independently of cosmic microwave background experiments and the distance ladder method. Our recent analysis of the third H0LiCOW system, HE 0435–1223, uses time delays from the COSMOGRAIL project, high-resolution Hubble Space Telescope imaging for the lens mass modeling, wide-field imaging and spectroscopy to characterize the lens environment, and spectroscopy to obtain the stellar velocity dispersion of the lens. For a flat ΛCDM cosmology, we obtain H0 = 71.9–3.0+2.4 km s–1 Mpc–1 from the combination of three H0LiCOW lenses. This result is in agreement with the latest distance ladder results and in mild tension with the Planck CMB results.
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