Why You’ll Love the Wood Ranger Power Shears for Your Garden

TandyCerda

Context. Inhomogeneities alongside the line of sight in strong gravitational lensing distort the photographs produced, in an effect referred to as shear. If measurable, this shear may provide impartial constraints on cosmological parameters, complementary to conventional cosmic shear. Aims. We mannequin 50 strong gravitational lenses from the Sloan Lens ACS (SLACS) catalogue with the aim of measuring the road-of-sight (LOS) shear for the primary time. We use the ‘minimal model’ for the LOS shear, which has been shown to be theoretically protected from degeneracies with lens mannequin parameters, a finding which has been confirmed utilizing mock data. Methods. We use the dolphin automated modelling pipeline, which makes use of the lenstronomy software as a modelling engine, to mannequin our selected lenses. We mannequin the principle deflector with an elliptical power regulation profile, the lens light with elliptical Sérsic profiles and the source with a foundation set of shapelets and an elliptical Sérsic profile. Results. We successfully acquire a line-of-sight shear measurement from 18 of the 50 lenses.

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