Abstract

We report on a search for long-duration microlensing events toward the Large Magellanic Cloud. We find none and therefore put limits on the contribution of high-mass objects to the Galactic dark matter. At a 95% confidence level, we exclude objects in the mass range of 0.3-30.0 M ? from contributing more than 4 × 10 11 M ? to the Galactic halo. Combined with earlier results, this means that objects with masses under 30 M ? cannot make up the entire dark matter halo if the halo is of typical size. For a typical dark halo, objects with masses under 10 M ? contribute less than 40% of the dark matter.