A SHARP view of H0LiCOW: H_{0} from three timedelay gravitational lens systems with adaptive optics imaging
Abstract
We present the measurement of the Hubble constant, H_{0}, with three strong gravitational lens systems. We describe a blind analysis of both PG 1115+080 and HE 04351223 as well as an extension of our previous analysis of RXJ 11311231. For each lens, we combine new adaptive optics (AO) imaging from the Keck Telescope, obtained as part of the SHARP (Stronglensing High Angular Resolution Programme) AO effort, with Hubble Space Telescope (HST) imaging, velocity dispersion measurements, and a description of the lineofsight mass distribution to build an accurate and precise lens mass model. This mass model is then combined with the COSMOGRAILmeasured time delays in these systems to determine H_{0}. We do both an AOonly and an AO + HST analysis of the systems and find that AO and HST results are consistent. After unblinding, the AOonly analysis gives H_{0}=82.8^{+9.4}_{8.3} km s^{1} Mpc^{1} for PG 1115+080, H_{0}=70.1^{+5.3}_{4.5} km s^{1} Mpc^{1} for HE 04351223, and H_{0}=77.0^{+4.0}_{4.6} km s^{1} Mpc^{1} for RXJ 11311231. The joint AOonly result for the three lenses is H_{0}=75.6^{+3.2}_{3.3} km s^{1} Mpc^{1}. The joint result of the AO + HST analysis for the three lenses is H_{0}=76.8^{+2.6}_{2.6} km s^{1} Mpc^{1}. All of these results assume a flat Λ cold dark matter cosmology with a uniform prior on Ω_{m} in [0.05, 0.5] and H_{0} in [0, 150] km s^{1} Mpc^{1}. This work is a collaboration of the SHARP and H0LiCOW teams, and shows that AO data can be used as the highresolution imaging component in lensbased measurements of H_{0}. The full timedelay cosmography results from a total of six strongly lensed systems are presented in a companion paper.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 December 2019
 DOI:
 10.1093/mnras/stz2547
 arXiv:
 arXiv:1907.02533
 Bibcode:
 2019MNRAS.490.1743C
 Keywords:

 gravitational lensing: strong;
 instrumentation: adaptive optics;
 distance scale;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 Astrophysics  Astrophysics of Galaxies
 EPrint:
 33 pages, 23 figures