Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-05-28
Astrophys.J. 577 (2002) 51-56
Astronomy and Astrophysics
Astrophysics
15pp 3 figs, accepted for publication in ApJ
Scientific paper
10.1086/342163
We derive an analytic expression for the mean magnification due to strong gravitational lensing, using a simple lens model, a singular isothermal sphere embedded in an external shear field. We compute separate expressions for 2-image and 4-image lensing. For 4-image lensing, the mean magnification takes a particularly simple form:
Carlivati Lisa P.
Finch Tehani K.
Schechter Paul L.
Winn Joshua N.
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