MASS DETERMINATION WITH GRAVITATIONAL MICROLENSING

摘要

We present a simple toy model of the distribution of objects responsible for gravitational microlensing. We use Monte Carlo simulations to demonstrate how difficult it is to determine the parameters of the lens mass distribution on the basis of the observed distribution of event timescales. A robust determination requires ～100 events, or more, even if the geometry of lens distribution and the lens kinematics are known.