MACHO Project Limits on Black Hole Dark Matter in the 1–30 [ITAL]M[/ITAL][TINF]⊙[/TINF] Range
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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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