H_{0} from ten wellmeasured time delay lenses
Abstract
In this work, we present a homogeneous curveshifting analysis using the differencesmoothing technique of the publicly available light curves of 24 gravitationally lensed quasars, for which time delays have been reported in the literature. The uncertainty of each measured time delay was estimated using realistic simulated light curves. The recipe for generating such simulated light curves with known time delays in a plausible range around the measured time delay is introduced here. We identified 14 gravitationally lensed quasars that have light curves of sufficiently good quality to enable the measurement of at least one time delay between the images, adjacent to each other in terms of arrivaltime order, to a precision of better than 20% (including systematic errors). We modeled the mass distribution of ten of those systems that have known lens redshifts, accurate astrometric data, and sufficiently simple mass distribution, using the publicly available PixeLens code to infer a value of H_{0} of 68.1 ± 5.9 km s^{1} Mpc^{1} (1σ uncertainty, 8.7% precision) for a spatially flat universe having Ω_{m} = 0.3 and Ω_{Λ} = 0.7. We note here that the lens modeling approach followed in this work is a relatively simple one and does not account for subtle systematics such as those resulting from lineofsight effects and hence our H_{0} estimate should be considered as indicative.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 August 2015
 DOI:
 10.1051/00046361/201423977
 arXiv:
 arXiv:1404.2920
 Bibcode:
 2015A&A...580A..38R
 Keywords:

 gravitational lensing: strong;
 methods: numerical;
 cosmological parameters;
 quasars: general;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 Published in A&