标题： M31暗晕的引力微透镜效应 显示英文标题

标题： Gravitational microlensing by the dark halo of M31

摘要： Paczyński已经证明，如果暗物质的质量位于近似范围 $10^{-6} < M/M_\odot < 10^{-1}$内，引力微透镜效应可能是探测银河系晕暗物质成分的一个有用方法。 目前，微透镜观测正在监测麦哲伦云和银河系 bulge 中的数百万颗恒星。 在这里，我讨论微透镜事件的主要特征：特别是它们的速率和概率。 显示英文摘要

摘要： It has been shown by Paczy\'nski that gravitational microlensing is potentially a useful method for detecting the dark constituents of the halo of our galaxy, if their mass lies in the approximate domain $10^{-6}<M/M_\odot<10^{-1}$. Microlensing observations now im progress monitor several millions of stars in the Large Magellanic Cloud and in the Galactic Bulge. Here I discuss the main features of the microlensing events: in particular their rates and probability.