Microlensing Rates from Self-consistent Galactic Models

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Abstract
We study different models of dark matter distribution for the halo of our galaxy. In particular, we consider Eddington and King-Michie models, which [C[C, which include anisotropy in the velocity space, and compute in a self-consistent way the amount of dark matter present in the halo. Assuming that the dark matter is in form of MACHOs, we find for each model the expected number of microlensing events and their average time duration for an experiment monitoring stars in the LMC. The main effect of including anisotropy is to reduce the microlensing rate by about 30% and to increase, but only slightly, the mean event duration as compared to the standard halo model. Consideration of different luminous models for the visible part of the galaxy also induce variations in the microlensing results by roughly the same amount as mentioned above. The main uncertainty, in order to be able to discriminate between different dark matter distributions and to estimate the fraction of it in form of MACHOs is due to the poor knowledge of the rotation velocity at large galactocentric distances.Comment: latex file, 2 figures to be requested at ingrosso@lecce.infn.i
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