Author:
Sharma Divij,Linder Eric V.
Abstract
Abstract
Double source lensing, with two sources lensed by the same
foreground galaxy, involves the distance between each source
and the lens and hence is a probe of the universe away from
the observer. The double source distance ratio also reduces sensitivity to
the lens model and has good complementarity with standard
distance probes. We show that using this technique at high
redshifts z > 1, to be enabled by data from the Euclid satellite and other surveys, can give insights on dark energy, both in terms of w
0–w
a
and redshift binned density. We find a dark energy figure of merit of 245 from combination of 256 double source systems with moderate quality cosmic microwave background and supernova data. Using instead five redshift bins between z = 1.1–5, we could detect the dark energy density out to z ≈ 5, or make measurements ranging between 31σ and 2.5σ of its values in the bins.
Subject
Astronomy and Astrophysics
Cited by
4 articles.
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