MACHO Project Limits on Black Hole Dark Matter in the 1-30 Solar Mass Range

Details MACHO Project Limits on Black Hole Dark Matter in the 1-30 Solar Mass Range MACHO Project Limits on Black Hole Dark Matter in the 1-30 Solar Mass Range

2000-11-28

arxiv.org/abs/astro-ph/0011506v1

Astronomy and Astrophysics

Astrophysics

6 pages, latex with 3 postscript figures, submitted to ApJ Letters

Scientific paper

10.1086/319636

We report on a search for long duration microlensing events towards the Large Magellanic Cloud. We find none, and therefore put limits on the contribution of high mass objects to the Galactic dark matter. At 95% confidence level we exclude objects in the mass range 0.3 solar masses to 30.0 solar masses from contributing more than 4 times 10^11 solar masses to the Galactic halo. Combined with earlier results, this means that objects with masses under 30 solar masses 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 solar masses contribute less than 40% of the dark matter.

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