The Main-Sequence Luminosity Function of the Galactic Halo

Recent results are collected on the luminosity function in the halo of the Galaxy. Several lines of evidence are converging on the conclusion that there is a turnover in the halo main sequence luminosity function and its associated initial mass function. These include: the luminoisty function in globular clusters, the luminosity function of high proper motion stars in the solar neighborhood, the luminosity function at large distances from the Galactic plane, and the mass distribution function of microlensing objects.