Estimation of the Influence of the Galactic Gravitational Field
on Microlensing

A. F. Zakharov* and M. V. Sazhin**

* Institute of Theoretical and Experimental Physics, ul. Bol’shaya Cheremushkinskaya 25, Moscow, 117259 Russia

** Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119899 Russia

Received March 1, 1996

Abstract—The distortion of the standard microlensing picture by the Galactic gravitational field is considered.
It is shown using a crude model that the effect of the Galactic gravitational field on microlensing by an approx-
imately solar-mass gravitational lens may cause significant variations in the light curve, similar to the double-
lens effect, though the probability of observing such an event is low.

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