Shear effects in microlensing of large sources
O. Wucknitz [1]
- Institute of Physics, University of Potsdam
Abstract
A very elegant approach to calculate the variations induced by microlensing
of large sources was published by Refsdal & Stabell already in 1991.
I present an alternative derivation which now allows to take into account
external shear. It will be shown that the inclusion of shear changes
the behaviour qualitatively. While in the shearless case it is only the
number of microlenses in front of the projected source that determine the
total magnification, lenses outside of the source area do contribute
significantly if shear is present. For negative parity images, the influence
of lenses in front of the source does even vanish completely, so that only the
outer lenses determine the microlensing signal.
This has important implications not only for the expected total variation but
also for the autocorrelation function of microlensing light curves.
A paper on the subject is in preparation.
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