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H0 from ten well-measured time delay lenses

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dc.contributor.author Rathna Kumar, S
dc.contributor.author Stalin, C. S
dc.contributor.author Prabhu, T. P
dc.date.accessioned 2020-11-17T14:40:36Z
dc.date.available 2020-11-17T14:40:36Z
dc.date.issued 2015-08
dc.identifier.citation Astronomy & Astrophysics, Vol. 580, A38 en_US
dc.identifier.issn 0004-6361
dc.identifier.uri http://prints.iiap.res.in/handle/2248/7186
dc.description Open Access © ESO http://dx.doi.org/10.1051/0004-6361/201423977 en_US
dc.description.abstract In this work, we present a homogeneous curve-shifting analysis using the difference-smoothing 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 arrival-time 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 H0 of 68.1 ± 5.9 km s-1 Mpc-1 (1σ uncertainty, 8.7% precision) for a spatially flat universe having Ωm = 0.3 and ΩΛ = 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 line-of-sight effects and hence our H0 estimate should be considered as indicative. en_US
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.subject Gravitational lensing: strong en_US
dc.subject Methods: numerical en_US
dc.subject Cosmological parameters en_US
dc.subject Quasars: general en_US
dc.title H0 from ten well-measured time delay lenses en_US
dc.type Article en_US


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